Numbers 8:21

Context8:21 The Levites purified themselves 1 and washed their clothing; then Aaron presented them like a wave offering before the Lord, and Aaron made atonement for them to purify them.
Numbers 16:45
Context16:45 “Get away from this community, so that I can consume them in an instant!” But they threw themselves down with their faces to the ground. 2
1 tn The verb is the Hitpael of חָטָּא (khatta’). In this stem the meaning of the root “to sin” is likely to be connected to the noun “sin/purification” offering in a denominative sense, although some would take it as a privative usage, “to remove sin.” The idea is clear enough: They performed all the ritual in order to purify themselves ceremonially.
2 tn Heb “they fell on their faces.”