Ezra 2:62
These sought their writing of those being enrolled, and they found not: and they will be polluted from the priesthood.
Numbers 3:10
And Aaron and his sons thou shalt set up, and they shall watch their priesthood; and the stranger coming near shall die.
Leviticus 21:21-23
Any man to whom in him a blemish from the seed of Aaron the priest, shall not come near to bring the sacrifices of Jehovah: a blemish is in him, the bread of his God he shall not come near to bring.
Numbers 16:39-40
And Eleazar the priest will take the brazen censers, which they being burnt brought near; and they shall beat them out a covering for the altar,
Numbers 18:7
And thou and thy sons with thee shall watch your priesthood for all the word of the altar, and to within the vail; and ye served: the services a gift I will give your priesthood; and the stranger coming near shall die.
Ezekiel 44:10-14
But the Levites who went far off from me, in the going astray of Israel who went astray from me after the blocks; and they bare their iniquity.