1 Samuel 20:8; 1 Samuel 20:42

8 Therefore deal kindly with your servant, for you have brought your servant into a covenant of the LORD with you. But if there is guilt in me, kill me yourself, for why should you bring me to your father?"

42 Then Jonathan said to David, "Go in peace, because we have sworn both of us in the name of the LORD, saying, 'The LORD shall be between me and you, and between my offspring and your offspring, forever.'" And he rose and departed, and Jonathan went into the city.