And also the {m} Strength of Israel will not lie nor repent: for he is not a man, that he should repent.

(m) Meaning God, who maintains and prefers his own.

Wesley's Notes

15:29 Strength of Israel - So he calls God here, to shew the reason why God neither will nor can lie; because lying proceeds from the sense of a man's weakness, who cannot many times accomplish his design without lying and dissimulation; therefore many princes have used it for this very reason. But God needs no such artifices; he can do whatsoever he pleaseth by his absolute power. Repent - That is, nor change his counsel; which also is an effect of weakness and imperfection, either of wisdom or power. So that this word is not here used in the sense it commonly is when applied to God, as in Jer 11:1 - 23, and elsewhere.

King James Translators' Notes

Strength: or, Eternity, or, Victory

Jamieson-Fausset-Brown Bible Commentary

29. the Strength of Israel will not lie-Hebrew, "He that gives a victory to Israel," a further rebuke of his pride in rearing the Carmel trophy, and an intimation that no loss would be sustained in Israel by his rejection.

Matthew Henry's Concise Commentary

15:24-31 There were several signs of hypocrisy in Saul's repentance. 1. He besought Samuel only, and seemed most anxious to stand right in his opinion, and to gain his favour. 2. He excuses his fault, even when confessing it; that is never the way of a true penitent. 3. All his care was to save his credit, and preserve his interest in the people. Men are fickle and alter their minds, feeble and cannot effect their purposes; something happens they could not foresee, by which their measures are broken; but with God it is not so. The Strength of Israel will not lie.