1 Samuel 19:6

I will go out and stand beside my father in the field where you are, and I will talk with my father about you; and if I see anything, I will tell you.”

Jonathan spoke good of David to Saul his father, and said to him, “Don’t let the king sin against his servant, against David; because he has not sinned against you, and because his works have been very good toward you;

for he put his life in his hand and struck the Philistine, and the LORD worked a great victory for all Israel. You saw it and rejoiced. Why then will you sin against innocent blood, to kill David without a cause?”

Jonathan called David, and Jonathan showed him all those things. Then Jonathan brought David to Saul, and he was in his presence as before.

There was war again. David went out and fought with the Philistines, and killed them with a great slaughter; and they fled before him.

An evil spirit from the LORD was on Saul as he sat in his house with his spear in his hand; and David was playing music with his hand.