וַיִּקַּ֞ח אֶלְעָזָ֣ר הַכֹּהֵ֗ן אֵ֚ת מַחְתּ֣וֹת הַנְּחֹ֔שֶׁת אֲשֶׁ֥ר הִקְרִ֖יבוּ הַשְּׂרֻפִ֑ים וַֽיְרַקְּע֖וּם צִפּ֥וּי לַמִּזְבֵּֽחַ׃
And Eleazar the priest took the brazen fire-pans, which they that were burnt had offered; and they beat them out for a covering of the altar,
Read midrashic interpretation of Numbers 17:4: and classical rabbinic exegesis.