1 Samuel 20:16-17, 42

So Jonathan made a solemn pact with David, saying, “May the LORD destroy all your enemies!” And Jonathan made David reaffirm his vow of friendship again, for Jonathan loved David as he loved himself.

At last Jonathan said to David, “Go in peace, for we have sworn loyalty to each other in the LORD’s name. The LORD is the witness of a bond between us and our children forever.” Then David left, and Jonathan returned to the town.