וַיֹּ֣אמֶר אֶֽל־אַהֲרֹ֗ן קַח־לְ֠ךָ עֵ֣גֶל בֶּן־בָּקָ֧ר לְחַטָּ֛את וְאַ֥יִל לְעֹלָ֖ה תְּמִימִ֑ם וְהַקְרֵ֖ב לִפְנֵ֥י יְהוָֽה׃
and he said unto Aaron: ‘Take thee a bull-calf for a sin-offering, and a ram for a burnt-offering, without blemish, and offer them before the LORD.
Read kabbalistic (mystical) interpretation of Leviticus 9:2: and classical mystical sources.