Acts 2:1-4 New King James Version (NKJV)

Coming of the Holy Spirit

2 When the Day of Pentecost had fully come, they were all ^[a]with one accord in one place. ² And suddenly there came a sound from heaven, as of a rushing mighty wind, and it filled the whole house where they were sitting. ³ Then there appeared to them ^[b]divided tongues, as of fire, and one sat upon each of them. ⁴ And they were all filled with the Holy Spirit and began to speak with other tongues, as the Spirit gave them utterance.

Acts 15:7-9 New King James Version (NKJV)

⁷ And when there had been much dispute, Peter rose up and said to them: “Men and brethren, you know that a good while ago God chose among us, that by my mouth the Gentiles should hear the word of the gospel and believe. ⁸ So God, who knows the heart, ^[a]acknowledged them by giving them the Holy Spirit, just as He did to us, ⁹ and made no distinction between us and them, purifying their hearts by faith.