Jonathan said to David, Go in peace, because we have sworn both of us in the name of Yahweh, saying, Yahweh shall be between me and you, and between my seed and your seed, forever. He arose and departed: and Jonathan went into the city.
And David sware moreover, and said, Your father certainly knows that you and I are good friends; and so he said, Don't let Jonathan know this, lest he is grieved: but truly as the Lord liveth, and as thy soul liveth, there is but a step between me and death ( 1 Samuel 20:3 ).