Bible Verses About Abishai: Seeks Saul's life

Then spake Dauid, and said to Ahimelech the Hittite, and to Abishai the sonne of Zeruiah, brother to Ioab, saying, Who will go downe with me to Saul to the hoste? Then Abishai said, I will goe downe with thee.

So Dauid and Abishai came downe to the people by night: and beholde, Saul lay sleeping within the fort, and his speare did sticke in the ground at his head: and Abner and the people lay round about him.

Then saide Abishai to Dauid, God hath closed thine enemie into thine hande this day: now therefore, I pray thee, let me smite him once with a speare to the earth, and I will not smite him againe.