Psalms 106:45

And he remembered for them his covenant - His solemn promises made to their fathers. He remembered that covenant in their behalf; or, on account of that, he came and blessed them. He had made gracious promises to the patriarchs; he had promised to be the God of their posterity; he had his own great purposes to accomplish through their nation in the distant future; and on these accounts, he came and blessed them.

And repented - He averted impending judgments. He checked and arrested the calamities which he was bringing upon them for their sins. He acted toward them as though his mind had been changed; as though he was sorry for what he was doing. The word “repent” can be applied to God in no other sense than this. It cannot be applied to him in the sense that he felt or admitted that he had done wrong; or that he had made a mistake; or that he had changed his mind or purposes; or that he intended to enter on a new course of conduct; but it may be applied to him in the sense that his treatment of people is “as if” he had changed his mind, or “as if” he were sorry for what he had done: that is, a certain course of things which had been commenced, would be arrested and changed to meet existing circumstances, because “they” had changed - though all must have been foreseen and purposed in his eternal counsels.

According to the multitude of his mercies - The greatness of his mercy; the disposition of his nature to show mercy; the repeated instances in which he had shown mercy in similar circumstances.