Exodus 17:12-14

Darby Translation

¹² And Moses' hands were heavy; then they took a stone, and put [it] under him, and he sat on it; and Aaron and Hur supported his hands, one on this side, and one on that side; and his hands were steady until the going down of the sun.

¹³ And Joshua broke the power of Amalek and his people with the edge of the sword.

¹⁴ And Jehovah said to Moses, Write this [for] a memorial in the book, and rehearse [it] in the ears of Joshua, that I will utterly blot out the remembrance of Amalek from under the heavens.