1 Samuel 23:21-23

Ye have compassion on me. There is something pitiable in Saul's answer. He had brooded over his rejection from being king, and the many indications that David was to be his successor, till he had become the prey of abject melancholy. He evidently regarded himself as a wronged and injured man, while David to his diseased imagination was ever conspiring against him and plotting his murder. With much prolixity he encourages them still to keep a close watch upon all David's movements, so as to know his place where his haunt is. Literally, "his place where his foot will be," the place whither he goes for rest and refuge. The reason he gives for this long and close observation of David's doings is that it is told him that he dealeth very subtilly . That is, according to Saul's information, he behaved with the utmost prudence, ever keeping a careful look out against surprise, and using much skill to conceal his movements and to provide for his escape from danger. Finally, they are to return with the certainty —with trustworthy and accurate information, and then Saul will gather his forces and search David out throughout all the thousands of Judah . These are the larger divisions of the territory of the tribe ( Numbers 1:16 ; Numbers 10:4 ), throughout which Saul will hunt for him till he has got him into his power.