Viewing verse 10 of 1 Samuel 20 (with context)
Read Full Chapter If he say thus, It is well; thy servant shall have peace: but if he be very wroth, then be sure that evil is determined by him.
Therefore thou shalt deal kindly with thy servant; for thou hast brought thy servant into a covenant of the LORD with thee: notwithstanding, if there be in me iniquity, slay me thyself; for why shouldest thou bring me to thy father?
And Jonathan said, Far be it from thee: for if I knew certainly that evil were determined by my father to come upon thee, then would not I tell it thee?
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.*