Charles Ellicott Commentary 1 Samuel 24:8

"David also arose afterward, and went out of the cave, and cried after Saul, saying, My lord the king. And when Saul looked behind him, David bowed with his face to the earth, and did obeisance." — 1 Samuel 24:8 (ASV)

And cried after Saul. —The outlaw allowed the king and his companion to proceed a little way—possibly down the steep path that led up to the cave’s mouth—and then called after Saul, but with an address of the deepest reverence, accompanied too (see next clause) by an act of the most profound homage an inferior could pay to a superior. He would show Saul that he was, at least, no rival king.