1 Samuel 21:2

And David said unto Ahimelech the priest,.... In reply to his question, and to account for such an appearance he made without an equipage:the king hath commanded me a business, and hath said unto me, let no man know anything of the business thereabout I send thee, and what I have commanded thee; he pretended he was upon a secret expedition, by the order of Saul, which none were to know of, no, not his own servants, and that was the reason why he came to him alone; which was a downright lie, and was aggravated by its being told only for the sake of getting a little food; and especially told to an high priest, and at the tabernacle of God, and when he was come to inquire of the Lord there; and was attended with a dreadful consequence, the slaughter of the Lord's priests there, which afterwards lay heavy on David's mind, 1Sa 22:22; and is the very sin he is thought to refer to in Ps 119:28.