1 Nephi 5:9; “And it came to pass that they did rejoice exceedingly, and did offer sacrifice and burnt offerings unto the Lord; and they gave thanks unto the God of Israel.”
Leviticus 1:7; “And the sons of Aaron the priest shall put fire upon the altar, and lay the wood in order upon the fire.”
In all Lehi took around 13 other people with him on his trek to America bringing the total to 14 people.
Not one single person in all that crowd was a priest which means no one was supposed to offer sacrifices to God. If you’re not a priest, you don’t perform sacrifices.
So how did this group give sacrifices during their trip to America and after they got here?