Many priests became believers in Jesus. That is amazing in that the very people who wanted to kill Jesus were allowed to believe and have eternal life. The only barrier was an unrepentant heart.

Source: Acts 6:7

Paul asked this early believer to forgive another believer who wronged him. Who is the believer and who is he asked to forgive?

The believer is Philemon an he is asked to forgive Onesimus. Onesimus was a former slave of Philemon it is believed he escaped and stole money from Philemon. According to church tradition both later became bishops.

Source: Philemon

This person let Paul down on his first missionary journey. Paul later forgave him. Who is this person?

This is Mark or John Mark who left in the middle of the first missionary journey. But afterwards was reconciled to Paul.

Source: Acts 15:37-39 2nd Timothy 4:11

In the New Testament this follower of Christ forgave his killers. He became famous for his death and manner of death. Who is he?

This is Stephen the first Christian martyr. His story is found in the book of Acts.

Source: Acts 7:59-60

This son of David attempted to become King instead of Solomon. What did Solomon do when this happened?

Solomon forgave him and he lived. However he tried once again to become King and was put to death.

Source: 1^st King 1:50-53

This old Testament hero forgave his 11 brothers who is he?