He confirmed it to Jacob as a decree, to Israel as an everlasting covenant:
God chose one people freely from all nations and bound Himself to them by covenant. He did not merely speak His promises to Abraham and his seed; He proved them true across centuries with unnumbered mercies, so that those delivered from Egypt would keep faith with Him and serve Him faithfully.
AI summary
Commenting on Psalm 105:1-45
And confirmed the same unto Jacob for a law. Jacob in his wondrous dream (Ge 28:10-15) received a pledge that the Lord's mode of procedure with him would be in accordance with covenant relations: for said Jehovah, "I will not leave thee till I have done that which I have spoken to thee of." Thus, if we may so speak with all reverence, the covenant...
In praising God, reach back to what He did when His church was founded, for we who live now reap the benefit of those ancient mercies. His promise to the patriarchs was not mere words but His command, binding for a thousand generations, and the entail of it shall never be cut off.
AI summary
Commenting on Psalm 105:8-24