Second Book of Kings (Author Compiled by Isaias from records of Samuel, David, Nathan, and Gad.)
21:15factum est autem rursum proelium Philisthinorum adversum Israhel et descendit David et servi eius cum eo et pugnabant contra Philisthim deficiente autem David
Original from The Bible Foundation - bf.org. They claim public domain status for their original text.