en_tn_condensed/num/18/07.md

only you and your sons

Here "you" and "your" are singular and refer to Aaron. Other occurrences of "you" and "your" are plural and refer to Aaron and his sons.

exercise the priesthood

"do the work of priests"

everything inside the curtain

"everything in the room behind the curtain"

Any foreigner who approaches must be put to death

"Any foreigner who approaches must die" or "You must put to death any foreigner who approaches"

who approaches

"who approaches the sacred things"