Are the three Acts groups the only ones who ever spoke in tongues in the Bible?
Yes. The three Acts groups—Jews at Pentecost (Acts 2), Gentiles in Cornelius’ house (Acts 10), and transitional Jews saved under John’s baptism (Acts 19)—are the only ones who came under the Holy Spirit’s manifestation of speaking in languages other than their normal ones.
Les explains that these three categories are the only ones in the Book of Acts who came under the manifestation of the power of the Holy Spirit to speak in languages other than their normal ones. He notes there was no need for interpreters and no emotional upheaval. The manifestation served a divine purpose: to show Israel that God was moving in the Holy Spirit, to prove to Jews that Gentiles were being saved, and to show the twelve Jews that the program had changed from John’s baptism and Christ’s earthly ministry to the work of the cross, His death, burial, and resurrection.