What are the three groups in Acts where speaking in tongues occurred?
Acts records three groups where speaking in tongues occurred: the nation of Israel in chapter 2, Gentiles in Cornelius' house in chapter 10, and Jews in transition in chapter 19 who had been saved under John's baptism but knew nothing of Paul's Gospel. These three categories are the only ones where the Holy Spirit manifested speaking in other languages.
Les teaches that the three groups in Acts where speaking in tongues occurred were: (1) the nation of Israel in chapter 2; (2) Gentiles in the house of Cornelius in chapter 10; and (3) Jews in transition in chapter 19—Jews saved under John's baptism who knew nothing of Paul's Gospel or the Body of Christ. He notes there was no need for interpreters and no emotional upheaval; it was simply the Holy Spirit working. The manifestation was always for a divine purpose: to prove something. It showed Israel that God was moving in the work of the Holy Spirit, proved to Jews in the house of the Gentiles that God was now saving Gentiles, and was manifested in these twelve Jews to show a change in the overall program—no longer based on John's baptism and Christ's earthly ministry, but on the work of the cross, His death, burial, and resurrection. Les also references I Corinthians 14:3, that the one who prophesies speaks to men for edification, exhortation, and comfort.
And when the day of Pentecost was fully come, they were all with one accord in one place.
See the restWhile Peter yet spake these words, the Holy Ghost fell on all them which heard the word.
See the restAnd it came to pass, that, while Apollos was at Corinth, Paul having passed through the upper coasts came to Ephesus: and finding certain disciples,
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Which groups in Acts spoke in languages other than their own?
Those three categories are the only ones that came under the manifestation of the power of the Holy Spirit to speak in languages other than the ones in which they normally practiced.
Why didn't the Acts 19 believers need interpreters when they spoke in tongues?
In the third category (the Acts 19 group), there was no need for interpreters and no emotional upheaval; it was simply the working of the Holy Spirit toward the third category of people God would deal with in the Book of Acts.
What was the second time in Acts that the Holy Spirit was manifested through speaking in tongues?
The Acts 10 event was the second time the Holy Spirit was manifested by giving the gift of speaking more languages than the speakers were normally living with.