Throughout the following examination of all of every occurrence of "repent" in the King James Bible, there are two heretical doctrines that are repeatedly examined.

The first is the common heretical belief that "sin" is somehow the intrinsic or automatic object of repentance, and that "repentance from sin" is a condition for eternal salvation.  Saving repentance is akin to believing on Jesus alone for salvation.  If someone refuses to believe that they are a sinner in need of salvation, then they obviously cannot believe that Jesus died for their sins.  To this extent, and this extent alone, one must repent of their sins to be saved.  They must acknowledge that they are a sinner in need of a Saviour.  But they are never required to turn from their sins, to promise or resolve to turn from their sins, or to pretend to have some profound remorse over their sins to receive God's gift of eternal salvation.  This is simply unknown to Scripture.  It is an invention of sinful man who insists that morality can save him.

On the other extreme is the less common, but growing belief that repentance is never presented as a requirement for salvation.  The logic usually goes something like this:  "The gospel of John says it was written that men may believe that Jesus is the Christ, the Son of the Living God, and that believing, they might have life in His name.  But John never uses any form of the word repentance.  Therefore, repentance is not a requirement for salvation."

Once someone believes that "repentance" means "turning from sin," arguing with these people is like arguing with a tomato can.  You might as well try to convince a pot-smoking surfer that they did not hear the voice of God when they were surfing.

Repentance throughout the New Testament, Introduction