וַיַּ֜עַשׂ אֶֽת־כָּל־כְּלֵ֣י הַמִּזְבֵּ֗חַ אֶת־הַסִּירֹ֤ת וְאֶת־הַיָּעִים֙ וְאֶת־הַמִּזְרָקֹ֔ת אֶת־הַמִּזְלָגֹ֖ת וְאֶת־הַמַּחְתֹּ֑ת כָּל־כֵּלָ֖יו עָשָׂ֥ה נְחֹֽשֶׁת׃
And he made all the vessels of the altar, the pots, and the shovels, and the basins, the flesh-hooks, and the fire-pans; all the vessels thereof made he of brass.
Read kabbalistic (mystical) interpretation of Exodus 38:3: and classical mystical sources.