I Chronicles 9:30 Midrash

וּמִן־בְּנֵי֙ הַכֹּ֣הֲנִ֔ים רֹקְחֵ֥י הַמִּרְקַ֖חַת לַבְּשָׂמִֽים׃

And some of the sons of the priests prepared the confection of the spices.

Read midrashic interpretation of I Chronicles 9:30: and classical rabbinic exegesis.