Reference for Deuteronomy 3:6

וַנַּחֲרֵ֣ם אוֹתָ֔ם כַּאֲשֶׁ֣ר עָשִׂ֔ינוּ לְסִיחֹ֖ן מֶ֣לֶךְ חֶשְׁבּ֑וֹן הַחֲרֵם֙ כָּל־עִ֣יר מְתִ֔ם הַנָּשִׁ֖ים וְהַטָּֽף׃

And we utterly destroyed them, as we did unto Sihon king of Heshbon, utterly destroying every city, the men, and the women, and the little ones.