民数記 8:22

כאשר צוה ה' ... כן עשו AS THE LORD HAD COMMANDED [MOSES CONCERNING THE LEVITES] SO DID THEY [UNTO THEM] — This is repeated (cf. v. 20) to tell the praise of those who performed the rite (Moses, Aaron and the Israelites) and those who had it performed on them (the Levites) — that none of them put any obstacle in the way.

וְאַחֲרֵי־כֵ֞ן בָּ֣אוּ הַלְוִיִּ֗ם לַעֲבֹ֤ד אֶת־עֲבֹֽדָתָם֙ בְּאֹ֣הֶל מוֹעֵ֔ד לִפְנֵ֥י אַהֲרֹ֖ן וְלִפְנֵ֣י בָנָ֑יו כַּאֲשֶׁר֩ צִוָּ֨ה יְהֹוָ֤ה אֶת־מֹשֶׁה֙ עַל־הַלְוִיִּ֔ם כֵּ֖ן עָשׂ֥וּ לָהֶֽם׃ {ס}        

And after that, the Levites went in to do their service in the Tent of Meeting before Aharon, and before his sons: as the Lord had commanded Moshe concerning the Levites, so they did to them.