And Saul's son Jonathan went to David at Horesh and helped him find strength in God. "Don't be afraid," he said. "My father Saul will not lay a hand on you. You will be king over Israel, and I will be second to you. Even my father Saul knows this." The two of them made a covenant before the LORD. Then Jonathan went home, but David remained at Horesh.

1 Samuel 23: 16-18

They're true friends.

True friends are giving support to each other, trustworthy, frank ...

Just like the scriptures said.