Charles Ellicott Commentary 2 Chronicles 29:22

"So they killed the bullocks, and the priests received the blood, and sprinkled it on the altar: and they killed the rams, and sprinkled the blood upon the altar: they killed also the lambs, and sprinkled the blood upon the altar." — 2 Chronicles 29:22 (ASV)

Received the blood. — Caught it in bowls for sprinkling (Numbers 8:14).

And sprinkled it on the altar. — Threw it against (literally, towards) the altar (Leviticus 8:19, 24).

Likewise, when. — And they slaughtered the rams ... and they slaughtered the lambs. The three clauses of the verse are symmetrical. The repetition is a mark of the writer’s eagerness to show how carefully the legitimate ritual was observed in each instance.

Killed. — Slaughtered (shahat; σφάζω, Genesis 37:31). This term is specifically used for slaying sacrificial victims (Leviticus 1:5).