John Wesley on 1 Samuel 15:26

I will not - This was no lie, though he afterwards returned, because he spoke what he meant; his words and his intentions agreed together, though afterwards he saw reason to change his intentions. Compare Gen 19:2,3. This may relieve many perplexed consciences, who think themselves obliged to do what they have said they would do, though they see just cause to change their minds. Hath rejected thee, &c. - But he does not say, he "hath rejected thee from salvation." And who besides hath authority to say so?