LXX Num 21:2

καὶ ηὔξατο Ἰσραὴλ εὐχὴν Τυρίῳ καὶ εἶπεν Ἐάν μοι παραδῷς τὸν λαὸν τοῦτον ὑποχείριον, ριον, ἀναθεματιῶ αὐτὸν καὶ τὰς πόλεις αὐτοῦ.

So Israel made a vow to the LORD: “If You will deliver this people into our hands, we will devote their cities to destruction.”