Exodus 17:14 WBT

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

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

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

¹⁵  And Moses built an altar, and called the name of it JEHOVAH-nissi:

¹⁶  For he said, Because the LORD hath sworn [that] the LORD [will have] war with Amalek from generation to generation.