KJV:
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.
NASB:
Yet David vowed again, saying, "Your father knows well that I have found favor in your sight, and he has said, 'Do not let Jonathan know this, or he will be grieved.' But truly as the LORD lives and as your soul lives, there is hardly a step between me and death."