Acts 2:14, 36-38

But Peter, standing up with the eleven, lifted up his voice, and spake forth unto them, saying, Ye men of Judæa, and all ye that dwell at Jerusalem, be this known unto you, and give ear unto my words.

Let all the house of Israel therefore know assuredly, that God hath made him both Lord and Christ, this Jesus whom ye crucified. Now when they heard this, they were pricked in their heart, and said unto Peter and the rest of the apostles, Brethren, what shall we do? And Peter said unto them, Repent ye, and be baptized every one of you in the name of Jesus Christ unto the remission of your sins; and ye shall receive the gift of the Holy Spirit.