And Saul came to a city of Amalek, and lay in wait in the valley.
1 Samuel 15:5
Surrounding context
15:4 So Saul gathered the people together and numbered them in Telaim, two hundred thousand foot soldiers and ten thousand men of Judah.
15:5 And Saul came to a city of Amalek, and lay in wait in the valley.
15:6 Then Saul said to the Kenites, "Go, depart, get down from among the Amalekites, lest I destroy you with them. For you showed kindness to all the children of Israel when they came up out of Egypt." So the Kenites departed from among the Amalekites.