For an offering, Heb. for a wave-offering. Of which see Exodus 29:24. Not that Aaron did so wave them, which he could not do, but that he caused or commanded them to imitate that motion, and to wave themselves towards the several parts of the world; whereby they might signify their readiness to serve God according to their capacity wheresoever they should be; though the word may be taken more generally for any offering made to God, as Exodus 35:22.
Related Commentaries of Numbers 8:11
Numbers 8:11
11 And Aaron shall offerb the Levites before the LORD for an offering of the children of Israel, that they may execute the service of the LORD.