Albert Barnes Commentary Leviticus 10:4

"And Moses called Mishael and Elzaphan, the sons of Uzziel the uncle of Aaron, and said unto them, Draw near, carry your brethren from before the sanctuary out of the camp." — Leviticus 10:4 (ASV)

The first cousins of Aaron (Exodus 6:22) are selected by Moses to convey the bodies of Nadab and Abihu out of the camp and bury them, probably because they were the nearest relations who were not priests. See (Numbers 9:6).