1 Samuel 20:41

20:41 When the servant had left, David got up from beside the mound, knelt with his face to the ground, and bowed three times. Then they kissed each other and they both wept, especially David.

1 Samuel 24:8

24:8 Afterward David got up and went out of the cave. He called out after Saul, “My lord, O king!” When Saul looked behind him, David kneeled down and bowed with his face to the ground.