Acts 2:1-4

1 The festival of Shavu'ot arrived, and the believers all gathered together in one place.

2 Suddenly there came a sound from the sky like the roar of a violent wind, and it filled the whole house where they were sitting.

3 Then they saw what looked like tongues of fire, which separated and came to rest on each one of them.

4 They were all filled with the Ruach HaKodesh and began to talk in different languages, as the Spirit enabled them to speak.