כָּל־דָּבָ֞ר אֲשֶׁר־יָבֹ֣א בָאֵ֗שׁ תַּעֲבִ֤ירוּ בָאֵשׁ֙ וְטָהֵ֔ר אַ֕ךְ בְּמֵ֥י נִדָּ֖ה יִתְחַטָּ֑א וְכֹ֨ל אֲשֶׁ֧ר לֹֽא־יָבֹ֛א בָּאֵ֖שׁ תַּעֲבִ֥ירוּ בַמָּֽיִם׃
every thing that may abide the fire, ye shall make to go through the fire, and it shall be clean; nevertheless it shall be purified with the water of sprinkling; and all that abideth not the fire ye shall make to go through the water.
Find Talmudic references to Numbers 31:23: , passages from the Talmud Bavli and Yerushalmi.