Psalms 105:8

8He hath remembered his covenant for ever The Psalmist now celebrates the effect and actual fulfillment of the covenant, and proves from the deliverance wrought for the Israelites what he had stated before, namely, That God, while he reigned alike over all nations, extended his peculiar favor to the offspring of Abraham alone. How comes it to pass that God, in delivering his people, displayed the might of his arm by so many miracles, if it was not that he might faithfully perform the promise which he had made to his servants in time past? It is evident, then, that the ancient covenant was the cause of the deliverance granted to the chosen tribes; for in order that God might faithfully keep his promises, it behooved him first to be merciful. As a long series of years had elapsed between the promise and the performance, the prophet uses the word remember, intimating that the Divine promises do not become obsolete by length of time, but that even when the world imagines that they are extinguished and wholly forgotten, God retains as distinct a remembrance of them as ever, that he may accomplish them in due season. This is more strongly confirmed in the next clause, where the correspondence between the form or tenor of the covenant and the accomplishment is celebrated. It is not for a day, he would say, or for a few days, that God has made a covenant with Abraham, nor has he limited the continuance of his covenant to the life of man, but he has promised to be the God of his seed even to a thousand generations. Although, therefore, the fulfillment was for a long time suspended, God nevertheless showed by the effect that his promise did not fail by length of time.