Num 3:10, 8:24-25, 1Ch 23:28, 2Ch 5:11-12, Pro 8:34, Isa 40:31 | ESV | STEP | And you shall appoint Aaron and his sons , and they shall guard their priesthood . But if any outsider comes near, he shall be put to death .

Numbers 3:10

10 And you shall appoint Aaron and his sons, and ^athey shall guard their priesthood. But if ^bany outsider comes near, he shall be put to death.”

Numbers 8:24-25

24 “This applies to the Levites: ^cfrom twenty-five years old and upward they ^{▼▼Hebrew he; also verses 25, 26} shall come to do duty in the service of the tent of meeting. 25 And from the age of fifty years they shall withdraw from the duty of the service and serve no more.

1 Chronicles 23:28

28 For their duty was to assist the sons of Aaron for the service of the house of the Lord, having the care of the courts and the chambers, the cleansing of all that is holy, and any work for the service of the house of God.

2 Chronicles 5:11-12

11 And when the priests came out of the Holy Place (for all the priests who were present had consecrated themselves, without regard to ^etheir divisions, 12 and all the Levitical ^fsingers, ^gAsaph, ^hHeman, and Jeduthun, their sons and kinsmen, arrayed in fine linen, with ⁱcymbals, harps, and lyres, stood east of the altar with 120 ^jpriests who were trumpeters;

Proverbs 8:34

34 ^kBlessed is the one who listens to me,
watching daily at my gates,
waiting beside my doors.

Isaiah 40:31

31 but ^lthey who wait for the Lord shall renew their strength;
they shall mount up with wings ^mlike eagles;
they shall run and not be weary;
they shall walk and not faint.