1 Samuel 20:12 (KJV)

Then said David to Jonathan, Who shall tell me? or what if thy father answer thee roughly?

And Jonathan said unto David, Come, and let us go out into the field. And they went out both of them into the field.

And Jonathan said unto David, O Lord God of Israel, when I have sounded my father about to morrow any time, or the third day, and, behold, if there be good toward David, and I then send not unto thee, and shew it thee;

The Lord do so and much more to Jonathan: but if it please my father to do thee evil, then I will shew it thee, and send thee away, that thou mayest go in peace: and the Lord be with thee, as he hath been with my father.

And thou shalt not only while yet I live shew me the kindness of the Lord, that I die not: