Numbers 8:20

And Moses and Aaron, and all the congregation of the children
of Israel
The several parties concerned in the consecration of the Levites: these did to the Levites according unto all that the Lord commanded Moses,
so did the children of Israel unto them:
which, as Jarchi notes, is said to the praise of them that did it, and of what was done by them; everything was done that was ordered, and in the manner in which it was prescribed; Moses sprinkled, or ordered to be sprinkled, the water of purification on them, and set them before the tabernacle, and before the Lord; the children of Israel laid their hands on them, and Aaron waved them, offered the sacrifices for them.