Bible Verses About Abishai: Seeks Saul's life

Then answered David and said to Ahimelech the Hittite, and to Abishai the son of Zeruiah, brother to Joab, saying, “Who will go down with me to Saul to the camp?” Abishai said, “I will go down with you.”

So David and Abishai came to the people by night: and, behold, Saul lay sleeping within the place of the wagons, with his spear stuck in the ground at his head; and Abner and the people lay around him.

Then Abishai said to David, “God has delivered up your enemy into your hand this day. Now therefore please let me strike him with the spear to the earth at one stroke, and I will not strike him the second time.”