Deuteronomy 18:5

for on him hath Jehovah thy God fixed, out of all thy tribes, to stand to serve in the name of Jehovah, He and his sons continually.

Deuteronomy 10:8

'At that time hath Jehovah separated the tribe of Levi, to bear the ark of the covenant of Jehovah, to stand before Jehovah, to serve Him, and to bless in His name, unto this day,

Deuteronomy 17:12

And the man who acteth with presumption, so as not to hearken unto the priest (who is standing to serve there Jehovah thy God), or unto the judge, even that man hath died, and thou hast put away the evil thing from Israel,

Exodus 28:1-14

And thou, bring thou near unto thee Aaron thy brother, and his sons with him, from the midst of the sons of Israel, for his being priest to Me, even Aaron, Nadab, and Abihu, Eleazar and Ithamar, sons of Aaron;

Numbers 3:10

'And Aaron and his sons thou dost appoint, and they have kept their priesthood, and the stranger who cometh near is put to death.'

Numbers 16:5

and he speaketh unto Korah, and unto all his company, saying, 'Morning! -- and Jehovah is knowing those who are his, and him who is holy, and hath brought near unto Him; even him whom He doth fix on He bringeth near unto Him.

Numbers 16:9-10

is it little to you that the God of Israel hath separated you from the company of Israel to bring you near unto Himself, to do the service of the tabernacle of Jehovah, and to stand before the company to serve them? --

Numbers 17:5-9

'And it hath come to pass, the man's rod on whom I fix doth flourish, and I have caused to cease from off me the murmurings of the sons of Israel, which they are murmuring against you.'

Numbers 25:13

and it hath been to him and to his seed after him a covenant of a priesthood age-during, because that he hath been zealous for his God, and doth make atonement for the sons of Israel.'

Treasury of Scripture Knowledge

Summary

For the LORD thy God hath chosen him out of all thy tribes, to stand to minister in the name of the LORD, him and his sons for ever.

Bible References

General references

Deuteronomy 10:8
'At that time hath Jehovah separated the tribe of Levi, to bear the ark of the covenant of Jehovah, to stand before Jehovah, to serve Him, and to bless in His name, unto this day,
Deuteronomy 17:12
And the man who acteth with presumption, so as not to hearken unto the priest (who is standing to serve there Jehovah thy God), or unto the judge, even that man hath died, and thou hast put away the evil thing from Israel,
Exodus 28:1
And thou, bring thou near unto thee Aaron thy brother, and his sons with him, from the midst of the sons of Israel, for his being priest to Me, even Aaron, Nadab, and Abihu, Eleazar and Ithamar, sons of Aaron;
Numbers 3:10
'And Aaron and his sons thou dost appoint, and they have kept their priesthood, and the stranger who cometh near is put to death.'
Numbers 16:5
and he speaketh unto Korah, and unto all his company, saying, 'Morning! -- and Jehovah is knowing those who are his, and him who is holy, and hath brought near unto Him; even him whom He doth fix on He bringeth near unto Him.
Numbers 17:5
'And it hath come to pass, the man's rod on whom I fix doth flourish, and I have caused to cease from off me the murmurings of the sons of Israel, which they are murmuring against you.'
Numbers 25:13
and it hath been to him and to his seed after him a covenant of a priesthood age-during, because that he hath been zealous for his God, and doth make atonement for the sons of Israel.'