Numbers 8:11
Aaron is to present the Levites before the LORD as a wave offering from the sons of Israel, so that they may perform the service of the LORD.
Berean Standard Bible
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.
and Aaron shall offer the Levites before the LORD for a wave offering on the behalf of the children of Israel, that it may be theirs to do the service of the LORD.