Reference for Sukkah 101:1

כתנאי (דתניא) עבדי כהנים היו דברי ר' מאיר רבי יוסי אומר משפחת בית הפגרים ומשפחת בית ציפריא ומאמאום היו שהיו משיאין לכהונה

This dispute is like the one between the following Tannas as we have learned: [The flute players in the Temple] were the slaves of the priests, the words of R. Meir. R. Yose says: They were the families of Beth Ha-Pegarim, and Beth Zipporia who hailed from Emmaus and were married into the priestly stock.

Jastrow