1 Samuel (Author Compiled by Isaiah from records of Samuel, David, Nathan, and Gad.)
Chapter 20
42And Jonathan said to David, Go in peace, forasmuch as we have sworn both of us in the name of the LORD, saying, The LORD be between me and thee, and between my seed and thy seed for ever. And he arose and departed: and Jonathan went into the city.
Original from The Bible Foundation - bf.org. They claim public domain status for their original text.