I am come to sacrifice unto the Lord That was one intention of his coming; and though there was another, namely, to anoint one of Jesse's sons to be king, he was not bound to declare it. For where there are two ends of any action, a person may, without any injury to truth, declare the one and conceal the other. Thus Moses did when he told Pharaoh they must go and sacrifice to God in the wilderness; but suppressed their intention to march to the land of Canaan. This is set in a clear light by Dr. Waterland: “As to Samuel pretending a sacrifice, it was a just pretence, and a true one; for he did offer sacrifice, as God had commanded him, 1 Samuel 16:5. And what if he had a further intention? was he bound to declare all he knew, or to disclose to every man the whole of his errand? Secrecy is of great use in all important business; and the concealing one design by going upon another, to prevent giving offence, or doing other worse mischief, is as righteous and as laudable a practice as the drawing a curtain to keep off spies. The making one good design the cover for a better is doing two good things at once; and both in a proper way; and though men have been blamed, and very justly, for using acts of religion as a cloak for iniquity, yet I have never heard that there could be any thing amiss in performing one act of obedience toward God in order to facilitate the performance of another.” See Scrip. Vind., p. 95.
He sanctified Jesse and his sons It seems evident that there was something peculiar in Jesse's invitation. For, first, both he and his sons were invited, whereas the others were only invited for their own persons. Secondly, the different phrase here used, that he sanctified these, when he only bade the others sanctify themselves, argues a singular care of Samuel in their sanctification. Which makes it probable that the rest were only to join with them in the act of sacrificing; but these, and only these, were invited to feast upon the remainders of the sacrifices.