Acts 1:5 where Jesus says to his disciples, “John baptized with water, but before many days you shall be baptized with the Holy Spirit.” Then in verse 8 he says, “You shall receive power when the Holy Spirit has come upon you; and you shall be my witnesses.” The fulfillment of these two promises came on the day of Pentecost.

Acts 2:2–4 says, “And suddenly a sound came from heaven like the rush of a mighty wind, and it filled all the house where they were sitting. And there appeared to them tongues as of fire distributed and resting on each one of them and they were all filled with the Holy Spirit and began to speak in other tongues as the Spirit gave them utterance.”