Now Amalek came and fought with Israel in Rephidim.
Exodus 17:8
Surrounding context
17:7 So he called the name of the place Massah and Meribah, because of the contention of the children of Israel, and because they tempted the LORD, saying, "Is the LORD among us or not?"
17:8 Now Amalek came and fought with Israel in Rephidim.
17:9 And Moses said to Joshua, "Choose us some men and go out, fight with Amalek. Tomorrow I will stand on the top of the hill with the rod of God in my hand."