Numbers 21:1-2

Young's Literal Translation

21 And the Canaanite -- king Arad -- dwelling in the south, heareth that Israel hath come the way of the Atharim, and he fighteth against Israel, and taketh [some] of them captive.

² And Israel voweth a vow to Jehovah, and saith, `If Thou dost certainly give this people into my hand, then I have devoted their cities;'