en_tn/num/08/15.md

You must purify them. You must offer them as a wave offering

Yahweh repeats these things to emphasize their importance. This must happen before the Levites go to serve at the tent of meeting. The full meaning of this statement can be made clear. Alternate translation: "But first, you must purify them. You must offer them as a wave offering" (See: rc://en/ta/man/jit/figs-explicit)

You must offer them as a wave offering

Aaron was to present the Levites to Yahweh as if they were a wave offering to him. Alternate translation: "You must dedicate them to me, as if you were presenting a wave offering to me" (See: rc://en/ta/man/jit/figs-simile)