Albert Barnes Commentary Leviticus 10:3

"Then Moses said unto Aaron, This is it that Jehovah spake, saying, I will be sanctified in them that come nigh me, and before all the people I will be glorified. And Aaron held his peace." — Leviticus 10:3 (ASV)

Rather, I will sanctify myself in them that come near to me (that is, the priests), and I will glorify myself before all the people. The words used by Moses on this occasion are not found elsewhere in the Pentateuch. But the sense is implied in such passages as (Exodus 19:22; Exodus 28:41; Exodus 29:1, Exodus 29:44).

Aaron’s silence on this occasion may be compared with his reasonable and natural expostulation with Moses when his surviving sons were rebuked for not having eaten the flesh of the sin-offering (Leviticus 10:19).