וְאֶת־הָאַ֥יִל הָאֶחָ֖ד תִּקָּ֑ח וְסָ֨מְכ֜וּ אַהֲרֹ֧ן וּבָנָ֛יו אֶת־יְדֵיהֶ֖ם עַל־רֹ֥אשׁ הָאָֽיִל׃
Thou shalt also take the one ram; and Aaron and his sons shall lay their hands upon the head of the ram.
Read kabbalistic (mystical) interpretation of Exodus 29:15: and classical mystical sources.