Exodus 17:12-15 Young's Literal Translation Of The Holy Bible (YLT98)

12. And the hands of Moses [are] heavy, and they take a stone, and set [it] under him, and he sitteth on it: and Aaron and Hur have taken hold on his hands, on this side one, and on that one, and his hands are stedfast till the going in of the sun;

13. and Joshua weakeneth Amalek and his people by the mouth of the sword.

14. And Jehovah saith unto Moses, `Write this, a memorial in a Book, and set [it] in the ears of Joshua, that I do utterly wipe away the remembrance of Amalek from under the heavens;'

15. and Moses buildeth an altar, and calleth its name Jehovah-Nissi,

Exodus 17