וַיִּשְׁחַ֖ט אֶת־הָעֹלָ֑ה וַ֠יַּמְצִאוּ בְּנֵ֨י אַהֲרֹ֤ן אֵלָיו֙ אֶת־הַדָּ֔ם וַיִּזְרְקֵ֥הוּ עַל־הַמִּזְבֵּ֖חַ סָבִֽיב׃
And he slew the burnt-offering; and Aaron’s sons delivered unto him the blood, and he dashed it against the altar round about.
Sforno on Leviticus
וימציאו, they used this opportunity to become trained in the priestly functions by assisting in their father’s personal sacrifice.