Acts 2:38, 41, 47b (NKJV) Then Peter said to them, "Repent, and let every one of you be baptized in the name of Jesus Christ for the remission of sins; and you shall receive the gift of the Holy Spirit... 41 Then those who gladly received his word were baptized; and that day about three thousand souls were added to them... 47 ... And the Lord added to the church daily those who were being saved.

1 Corinthians 12:13 (NKJV) For by one Spirit we were all baptized into one body — whether Jews or Greeks, whether slaves or free — and have all been made to drink into one Spirit.