Parashas Tetzaveh · Passuk 29:35
Chabad.org — English translation + Rashi
Torah Temimah points to Yerushalmi Yoma 7:3 (verified).
Sefaria — Exodus 29:35
Sefaria — Yoma 5a
E-Daf — Yoma 5a
English: The Yerushalmi compares the garments of Aaron’s sons with Aaron’s garments: just as Aaron’s garments contain shaatnez, so do the garments of his sons.
On the daf / in context: See the cited source for the full section.
Derash on the verse.
The Torah’s comparison establishes that the priestly garments of Aaron’s sons also contain shaatnez.