וַיִּפְקֹ֥ד אֹתָ֛ם מֹשֶׁ֖ה עַל־פִּ֣י יְהוָ֑ה כַּאֲשֶׁ֖ר צֻוָּֽה׃
And Moses numbered them according to the word of the LORD, as he was commanded.
Read Midrashic interpretations of Numbers 3:16: rabbinic exegesis from Bereshit Rabbah, Shemot Rabbah and classical Midrash sources, free.