Exodus 17:14

14Then the Lord said to Moses, “Write this as a memorial in a book and recite it in the ears of aJoshua, that bI will utterly blot out the memory of Amalek from under heaven.”

Deuteronomy 25:19

19Therefore cwhen the Lord your God has given you rest from all your enemies around you, in the land that the Lord your God is giving you for an inheritance to possess, you shall dblot out the memory of Amalek from under heaven; you shall not forget.

1 Samuel 15:3

3Now go and strike Amalek and edevote to destruction
That is, set apart ( devote) as an offering to the Lord (for destruction); also verses 8, 9, 15, 18, 20, 21
all that they have. Do not spare them, gbut kill both man and woman, child and infant, ox and sheep, camel and donkey.’”

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