Numbers 8:11

Overview - Numbers 8
How the lamps are to be lighted.
The consecration of the Levites.
23 The age and time of their service.
Treasury of Scripture Knowledge

Numbers 8:11  (King James Version)
And Aaron shall offer the Levites before the LORD for an offering of the children of Israel, that they may execute the service of the LORD.

Hebrew wave. offering. Hebrew wave-offering.
Not that they were actually waved, but they were presented to God, as the God of heaven, and the Lord of the whole earth, as the wave offerings were; and in calling them wave-offerings, it was intimated to them that they must move to and fro with readiness in the business of their profession.
6:20 Exodus 29:24 ; Leviticus 7:30 ; Leviticus 8:27 Leviticus 8:29

they may execute
Hebrew they may be to execute, etc.
1:49-53 3:5-43