שמות ו:ד פירוש: רש״י, ספורנו, אור החיים וטור הארוך

וגם הקמתי את בריתי וגו׳ Then, ALSO, when I appeared unto them by the name of God Almighty I ESTABLISHED and set up MY COVENANT between Myself and them

וגם הקימותי, I have also sworn, as per Onkelos in Genesis 31,53 on the word וישבע which he renders as וקיים. “G’d swore to keep His promise.” Compare a similar phrase but worded differently in Psalms 106, 44-45. “When He saw that they were in distress, when He heard their cry, He was mindful of His covenant and in His great faithfulness He relented.”

וגם הקימותי את בריתי, "And I also maintain My covenant, etc." G'd may have added here (according to our previous commentary) that even if He had already fulfilled His covenant with the patriarchs, they still would not have become privy to the degree of revelation that Moses had already now become privy to.