1 Samuel 23:22-23

22Go now, be more persistent, and investigate and see his place where 1he is hiding, and who has seen him there; for I am told that he is very cunning. 23So look, and learn about all the hiding places where he keeps himself hidden, and return to me with certainty, and I will go with you; and if he is in the land, I will search him out among all the thousands of Judah.”