וַיִּשְׁחַ֖ט אֶת־הָעֹלָ֑ה וַ֠יַּמְצִאוּ בְּנֵ֨י אַהֲרֹ֤ן אֵלָיו֙ אֶת־הַדָּ֔ם וַיִּזְרְקֵ֥הוּ עַל־הַמִּזְבֵּ֖חַ סָבִֽיב׃
И он убил всесожжения; и Аарон'Сыновья принесли ему кровь, и он разбил ее об алтарь вокруг.
Sforno
וימציאו, they used this opportunity to become trained in the priestly functions by assisting in their father’s personal sacrifice.
Ibn Ezra
handed him In Hebrew the literal meaning of the verb is “caused him to find”. This form is used because a bullock which met the age and appearance specifications had to be found .