א וְאֵלֶּה תּוֹלְדֹת אַהֲרֹן וּמֹשֶׁה בְּיוֹם דִּבֶּר יְהֹוָה אֶת־מֹשֶׁה בְּהַר סִינָי׃
Following these words which introduce the census of the tribe of Levi, the Bible goes on to list only the descendants of Aharon and not those of Moshe, Levi’s most famous offspring. According to Rashi, Aharon’s descendants were considered to be Moshe’s as well, since Moshe was the one who taught them God’s word. Although Aharon was their biological father, providing them with physical life, Moshe became their spiritual father, providing for them a life of fulfillment and holiness. Without this spiritual life, their physical lives would have been lacking, devoid of meaning and purpose. How great it is to spread Hashem’s message to others, for in doing so you are giving them life, just as Moshe did.