גַּם־מִיּוֹם֙ אֲנִ֣י ה֔וּא וְאֵ֥ין מִיָּדִ֖י מַצִּ֑יל אֶפְעַ֖ל וּמִ֥י יְשִׁיבֶֽנָּה׃ (ס)
Oui, dès l’origine des jours, je suis le même, personne ne saurait sauver de ma main; mon action, qui peut l’entraver?
Rashi on Isaiah
Even before the day I am He Not only that day was I alone, but even before it became day I am He alone.
Ibn Ezra on Isaiah
Before the day was, etc. I was God before the existence of day. Therefore, the word גם yea is added.
Rashi on Isaiah
I do If I came to do, no one can retract.