Parashas Acharei Mos · Passuk 16:06
Chabad.org — English translation + Rashi
Torah Temima points to Yoma (beito = his wife).
English: “And for his household” — his household is his wife; for one household and not for two households.
One wife for the Kohen Gadol
On Yom Kippur the Kohen Gadol’s kapparah for “beito” assumes a single wife; if he has two, one must be divorced before the service.