Speaking in tongues
Are tongues the initial evidence of baptism in the Holy Spirit?
Evidences pointing to tongues being the initial evidence
Tongues were obviously significantly associated with the Holy Spirit's initializing of the believer into the new covenant of Christ, as illustrated at Pentecost (Acts 2) and in Cornelius’ home (Acts 10), and also probably in Samaria (Acts

and Ephesus (Acts 19).
(Acts 2:4 NIV) All of them were filled with the Holy Spirit and began to speak in other tongues as the Spirit enabled them.
(Acts 10:45-46 NIV) The circumcised believers who had come with Peter were astonished that the gift of the Holy Spirit had been poured out even on the Gentiles. {46} For they heard them speaking in tongues and praising God. Then Peter said,
(Acts 19:6 NIV) When Paul placed his hands on them, the Holy Spirit came on them, and they spoke in tongues and prophesied.
(Acts 8:17-18 NIV) Then Peter and John placed their hands on them, and they received the Holy Spirit. {18} When Simon saw that the Spirit was given at the laying on of the apostles' hands, he offered them money
The passage above does not mention tongues. However, it is probable that tongues or at least some kind of visible evidence is involved. This is because the passage says that Simon “saw” that the Spirit was given.
Evidences pointing to tongues not being the initial evidence
OT instances of filling by the Holy Spirit not accompanied by tongues
The experience of receiving the Holy Spirit at Pentecost was not a new experience. It is the start of a new era in which the Spirit will be poured out more abundantly on all flesh. Peter explains that it is fulfillment of the prophesy in Joel which says that the Spirit will be poured on all people, young and old, men and women, even servants. In the Old Testament, this was not the case. The Spirit fell on key persons, empowering them to carry out the special office of God e.g. kings, prophets.
(Acts 2:17-18 NIV) "'In the last days, God says, I will pour out my Spirit on all people. Your sons and daughters will prophesy, your young men will see visions, your old men will dream dreams. {18} Even on my servants, both men and women, I will pour out my Spirit in those days, and they will prophesy.
In the past, only a few selected ones are filled with the Spirit and empowered for certain tasks. While these people of the OT times were filled and empowered by the Spirit, there was no evidence of tongues.
Charismatics response
Tongues are the evidence of the baptism of the Holy Spirit only in the New Testament period.
No evidence of Paul speaking in tongues when he first received the Holy Spirit
(Acts 9:17-19 NIV) Then Ananias went to the house and entered it. Placing his hands on Saul, he said, "Brother Saul, the Lord--Jesus, who appeared to you on the road as you were coming here--has sent me so that you may see again and be filled with the Holy Spirit." {18} Immediately, something like scales fell from Saul's eyes, and he could see again. He got up and was baptized, {19} and after taking some food, he regained his strength. Saul spent several days with the disciples in Damascus.
Paul later spoke in tongues (1 Cor 14:18) but that was not the initial evidence; it was the gift of the Holy Spirit.
Why did Paul not speak in tongues when he first received the Holy Spirit? It could be because there was no need for it. Tongues serve as a sign. In the instances when the people spoke in tongues, it either served as a sign to non-believers (Acts 2) or to other believers that the ones who spoke in tongues really received the Holy Spirit and were part of them.
Tongues are described as a gift
We know that in the Corinthian church not everyone speaks in tongues.
(1 Cor 12:29-30 NIV) Are all apostles? Are all prophets? Are all teachers? Do all work miracles? {30} Do all have gifts of healing? Do all speak in tongues ? Do all interpret?
The reason why some do not speak in tongues was not because some were not baptized in the Holy Spirit but rather some were not given that gift by the Spirit.
(1 Cor 12:4-11 NIV) There are different kinds of gifts, but the same Spirit. {5} There are different kinds of service, but the same Lord. {6} There are different kinds of working, but the same God works all of them in all men. {7} Now to each one the manifestation of the Spirit is given for the common good. {8} To one there is given through the Spirit the message of wisdom, to another the message of knowledge by means of the same Spirit, {9} to another faith by the same Spirit, to another gifts of healing by that one Spirit, {10} to another miraculous powers, to another prophecy, to another distinguishing between spirits, to another speaking in different kinds of tongues, and to still another the interpretation of tongues. {11} All these are the work of one and the same Spirit, and he gives them to each one, just as he determines.
Furthermore, it is the Spirit’s choice to give whomsoever He wants the ability to speak in tongues. There is no mention whatsoever of speaking in tongues being an inevitable outcome of having been baptized by the Holy Spirit.
Are tongues always human languages?
There are many instances when tongues are real languages that man can understand.
(Acts 2:4-6 NIV) All of them were filled with the Holy Spirit and began to speak in other tongues as the Spirit enabled them. {5} Now there were staying in Jerusalem God-fearing Jews from every nation under heaven. {6} When they heard this sound, a crowd came together in bewilderment, because each one heard them speaking in his own language.
(Acts 10:45-46 NIV) The circumcised believers who had come with Peter were astonished that the gift of the Holy Spirit had been poured out even on the Gentiles. {46} For they heard them speaking in tongues and praising God.
The fact that the Apostles understood the Gentiles tongues to be magnifying God indicated that the tongues were a know language to the Apostles.
However, there are also tongues that are not human languages.
(1 Cor 13:1 NIV) If I speak in the tongues of men and of angels, but have not love, I am only a resounding gong or a clanging cymbal.
There are tongues of angels that man will not be able to understand.
(1 Cor 14:2 NIV) For anyone who speaks in a tongue does not speak to men but to God. Indeed, no one understands him; he utters mysteries with his spirit.
Different purposes of tongues
The argument between Charismatics and non-Charismatics on what is the purpose of tongues can be simply solved if one realizes that there are more than one purpose of tongues.
Act as a sign to unbelievers
(1 Cor 14:21-22 NIV) In the Law it is written: "Through men of strange tongues and through the lips of foreigners I will speak to this people, but even then they will not listen to me," says the Lord. {22} Tongues, then, are a sign, not for believers but for unbelievers…
Tongues are a sign to unbelievers because when they hear the message proclaimed in their own tongues by someone who does not speak that language, it is a miraculous sign that it is God speaking through them.
(Acts 2:6-11 NIV) When they heard this sound, a crowd came together in bewilderment, because each one heard them speaking in his own language. {7} Utterly amazed, they asked: "Are not all these men who are speaking Galileans? {8} Then how is it that each of us hears them in his own native language? {9} Parthians, Medes and Elamites; residents of Mesopotamia, Judea and Cappadocia, Pontus and Asia, {10} Phrygia and Pamphylia, Egypt and the parts of Libya near Cyrene; visitors from Rome {11} (both Jews and converts to Judaism); Cretans and Arabs--we hear them declaring the wonders of God in our own tongues!"
(Acts 10:45-46 NIV) The circumcised believers who had come with Peter were astonished that the gift of the Holy Spirit had been poured out even on the Gentiles. {46} For they heard them speaking in tongues and praising God.
God also used tongues to convince unbelieving Christian Jews that the Gentiles could receive the Holy Spirit, and that they ought to be welcomed as equals into the Church. Without tongues, the apostles would not have been convinced that the Gentiles could be saved.
When tongues are used for this purpose, it is very specific. That means that there may be long periods of time when this type of tongues cease to exist.
Acts 11:15. "As I began to speak, the Holy Ghost fell on them, as on us at the beginning."
The outpouring of the Holy Spirit at Cornelius' house occurred eight years after Pentecost, yet Peter could not point to any continuous flow of tongues for this purpose among the churches, when he explained to the Jerusalem church leaders what had happened to the Gentiles. After eight years, Peter still had to say "As on us at the beginning", not "as on all the churches regularly". If speaking in tongues in a known language was a normal experience in churches, Peter would not have had to reach back to Pentecost to cite a similar example.
Edifying of oneself
Besides serving as “signs”, there are other purposes of tongues that do not involve “signs to unbelievers”.
Paul refers to the Christians speaking in tongues without interpretation in a church. Because the tongues are unknown, they do not communicate anything to people and do not serve as signs.
(1 Cor 14:2 NIV) For anyone who speaks in a tongue does not speak to men but to God. Indeed, no one understands him; he utters mysteries with his spirit.
The purpose of this type of tongues is not to serve as signs but rather to edify the speaker.
(1 Cor 14:4 NIV) He who speaks in a tongue edifies himself, but he who prophesies edifies the church.
Edifying of the church
Tongues that are accompanies by interpretation edifies the church.
(1 Cor 14:5 NIV) I would like every one of you to speak in tongues, but I would rather have you prophesy. He who prophesies is greater than one who speaks in tongues, unless he interprets, so that the church may be edified.