TT #33 · Parshas Shemini · Aliyah 2 · Passuk 22
Chabad.org — English translation + Rashi
English: “He blessed them and descended”: the unusual order teaches that during his descent from the altar Aaron raised his hands and blessed the people.
Jerusalem Talmud, Taanis 4:1.
Textual inference — the unusual order of “he blessed them and descended” teaches that the priestly blessing accompanies the descent from the altar.
The unusual word order is read as teaching that the priest blesses the people while descending from the altar, supporting the practice of priestly blessing in Musaf.