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כאשר צוה ה' … כן עשו. לְהַגִּיד שֶׁבַח הָעוֹשִׂין וְהַנַּעֲשֶׂה בָהֶן, שֶׁאֶחָד מֵהֶם לֹא עִכֵּב: 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.