Yea, before the day was I am he; and there is none that can deliver out of my hand: I will work, and who shall let it? Yea, before the day (was) I (am) he - literally, from the time of the first existence of day (Hebrew, miyowm (H3117)).
I will work, and who shall let it? "Let" - old English for hinder (Isaiah 14:27). 'Undo it' (Horsley).