Exodus 17:16

Overview - Exodus 17
The people murmur for water at Rephidim.
God sends them for water to the rock in Horeb.
The place is called Massah and Meribah.
Amalek is overcome by Joshua, while Moses holds up his hands with the rod of God.
14 Amalek is doomed to destruction; and Moses builds the altar JEHOVAH-nissi.
Treasury of Scripture Knowledge

Exodus 17:16  (King James Version)
For he said, Because the LORD hath sworn that the LORD will have war with Amalek from generation to generation.

Because, etc or, Because the hand of Amalek is against the
throne of the Lord, therefore, etc
the Lord, etc. Hebrew the hand upon the throne of the Lord.
Isaiah 66:1 ; Acts 7:49

will have war
Psalms 21:8-11