English: “His offering” — to exclude the stolen. “Sheep and goats” — to exclude kilayim (cross-breeds).
In Sifra: “His offering” implies legitimate ownership; a stolen animal cannot become a valid olah. Specifying both sheep and goats (rather than a single term) excludes an animal that is a hybrid of the two species.
Type of Learning
R’ Eliezer #2 (מיעוט) / ownership requirement + species purity.
What Is Learned
An olah from the flock must be the offerer’s own property and must be a pure sheep or pure goat; neither a stolen animal nor a kilayim hybrid qualifies.