Second Book of Kings (Author Compiled by Isaias from records of Samuel, David, Nathan, and Gad.)
Chapter 21
17And Abisai the son of Sarvia rescued him, and striking the Philistine killed him. Then David's men swore unto him saying: Thou shalt go no more out with us to battle, lest thou put out the lamp of Israel.
Original from Project Gutenberg - Massive cleanup of OCR problems and editing done locally.