אֲשֶׁ֣ר יָ֭דִי תִּכּ֣וֹן עִמּ֑וֹ אַף־זְרוֹעִ֥י תְאַמְּצֶֽנּוּ׃
我的手必與他同在，扶助他；我的膀臂也必使他堅強。
Otzar Midrashim
12) "And what's more, I chose you over all Israel, and you will in the future be one prophesied over about this," as it is said, "Then You spoke in vision to Your faithful, and said, 'I have set a help to the mighty, I have exalted one chosen from the people'" (Psalm 89:22). Who is chosen from the people? Moshe. Despite all this, Moshe lowered himself and stood to one side. The Holy Blessed One said, "Why do you stand to one side? For if by your hand they are not redeemed, by another's hand they will not be redeemed!"