John Wesley on 1 Samuel 20:8

Deal kindly - In giving me timely notice, and a true account of Saul's disposition and intention towards me. A covenant of the Lord - That is, a solemn covenant, not lightly undertaken, but seriously entered into, in the name and fear of God, and in his presence, calling him to be the witness of our sincerity therein, and the avenger of perfidiousness in him that breaks it. Slay me - I am contented thou shouldst kill me. For why - Why shouldst thou betray me to thy father, by concealing his evil intentions from me?