And Moses told [it] to Aaron, and to his sons
What God had said to him concerning the priests defiling themselves for the dead, both common priests and high priest, and concerning their marriages and their blemishes; that they might be careful not to transgress the laws and rules given them concerning those things:
and to all the children of Israel;
to the heads of the tribes and elders of the people, and by them to the whole, that they might know who were fit, and who not, to put their sacrifice into their hands, to offer for them: Jarchi thinks this was to warn the sanhedrim concerning the priests, whose business it was to examine and judge who were fit for service and who not; for so we are told F11, that in the chamber Gazith, or of hewn stone, the great sanhedrim of Israel sat and judged the priests, and rejected some and received others.
F11 Misn. Middot, c. 5. sect. 3.