1 Samuel 14:48
"And he gathered an host, and smote the Amalekites, and delivered Israel out of the hands of them that spoiled them."
Cross References (ranked by relevance)
Deuteronomy 25:19
Therefore it shall be, when the LORD thy God hath given thee rest from all thine enemies round about, in the land which the LORD thy God giveth thee for an inheritance to possess it, that thou shalt blot out the remembrance of Amalek from under heaven; thou shalt not forget it.
Exodus 17:14
And the LORD said unto Moses, Write this for a memorial in a book, and rehearse it in the ears of Joshua: for I will utterly put out the remembrance of Amalek from under heaven.