Parashas Tetzaveh · Passuk 29:9
Chabad.org — English translation + Rashi
Torah Temimah points to Yoma 6a (verified).
Sefaria — Exodus 29:9
Sefaria — Yoma 6a
E-Daf — Yoma 6a
English: The Gemara asks how Aaron and his sons were dressed during the inauguration, not to establish what happened historically but to reconcile the wording of the command with the wording of the execution. Two traditions differ: Aaron was dressed before his sons, or Aaron and his sons were dressed together.
On the daf / in context: See the cited source for the full section.
Derash on the verse.
The derashah resolves an apparent conflict between the command to dress Aaron and his sons and the narrative describing their actual dressing.