First Book of Kings (Author Compiled by Isaias from records of Samuel, David, Nathan, and Gad.)
27:8et ascendit David et viri eius et agebant praedas de Gesuri et de Gedri et de Amalechitis hii enim pagi habitabantur in terra antiquitus euntibus Sur usque ad terram Aegypti
Original from The Bible Foundation - bf.org. They claim public domain status for their original text.