Acts 2:4
"And they were all filled with the Holy Ghost, and began to speak with other tongues, as the Spirit gave them utterance."Acts 2:4 (KJV)
Context from Acts 2
2
And suddenly there came a sound from heaven as of a rushing mighty wind, and it filled all the house where they were sitting.
3
And there appeared unto them cloven tongues like as of fire, and it sat upon each of them.
4
And they were all filled with the Holy Ghost, and began to speak with other tongues, as the Spirit gave them utterance.
5
And there were dwelling at Jerusalem Jews, devout men, out of every nation under heaven.
6
Now when this was noised abroad, the multitude came together, and were confounded, because that every man heard them speak in his own language.