That Christian baptism required an understanding of God’s Word and an intelligent decision to present oneself to do the revealed will of God was evident when, at Pentecost, 33 C.E., the Jews and proselytes there assembled, who already had a knowledge of the Hebrew Scriptures, heard Peter speak about Jesus the Messiah, with the result that 3,000 “embraced his word heartily” and “were baptized.” (Ac 2:41; 3:19–4:4; 10:34-38)
... Later, after speaking of Jesus as “the Chief Agent of life,” Peter said to Jews at the temple: “Repent, therefore, and turn around so as to get your sins blotted out, that seasons of refreshing may come from the person of Jehovah.” (Ac 3:15, 19)