Parallel
Exodus 17:12
Brenton's English Septuagint · Berean Standard Bible
But the hands of Moses were heavy, and they took a stone and put it under him, and he sat upon it; and Aaron and Or supported his hands one on this side and the other on that, and the hands of Moses were supported till the going down of the sun.
When Moses’ hands grew heavy, they took a stone and put it under him, and he sat on it. Then Aaron and Hur held his hands up, one on each side, so that his hands remained steady until the sun went down.