1 Samuel 20:3

20:3 David swore moreover, and said, Your father knows well that I have found favor in your eyes; and he says, Don't let Jonathan know this, lest he be grieved: but truly as Yahweh lives, and as your soul lives, there is but a step between me and death.
-World English Bible

Other Translation

20:3 And David sware moreover, and said, Thy father certainly knoweth that I have found grace in thine eyes; and he saith, Let not Jonathan know this, lest he be grieved: but truly [as] the LORD liveth, and [as] thy soul liveth, [there is] but a step between me and death.
-King James Version