Jamieson, Fausset and Brown on 1 Samuel 20:19

19. when thou hast stayed three days--either with your family at Beth-lehem, or wherever you find it convenient.

come to the place where thou didst hide thyself when the business was in hand--Hebrew, "in the day," or "time of the business," when the same matter was under inquiry formerly (1Sa 19:22).

remain by the stone Ezel--Hebrew, "the stone of the way"; a sort of milestone which directed travellers. He was to conceal himself in some cave or hiding-place near that spot.