Those who gladly received the word of Peter in Acts 2, were baptized. A group of about 3000 on that inaugural day of the New Testament church had responded to the instructions of Peter in Acts 2:38.
But those who experienced Acts 2:38, needed to continue steadfastly.
To all who experience Acts 2:38, there is more to being saved than a once in lifetime experience. Salvation must become a way of living.