en_tn_condensed/num/09/10.md

unclean

A person who God considers spiritually unacceptable or defiled is spoken of as if the person were physically unclean. (See: rc://en/ta/man/jit/figs-metaphor)

because of a dead body

This refers to someone touching a dead body. Alternate translation: "because you have touched a dead body" (See: rc://en/ta/man/jit/figs-explicit)

keep the Passover

Here the word "keep" means to observe. Alternate translation: "observe the Passover" or "celebrate the Passover" (See: rc://en/ta/man/jit/figs-idiom)