For the LORD your God has chosen him out of all your tribes to stand to minister in the name of the LORD, him and his sons forever.
Deuteronomy 18:5
Surrounding context
18:4 The firstfruits of your grain and your new wine and your oil, and the first of the fleece of your sheep, you shall give him.
18:5 For the LORD your God has chosen him out of all your tribes to stand to minister in the name of the LORD, him and his sons forever.
18:6 "So if a Levite comes from any of your gates, from where he dwells among all Israel, and comes with all the desire of his mind to the place which the LORD chooses,