Targum zu Wajikra 9:2

And he said to Aharon, Take thou a calf, the young of a bullock, for a sin offering, that Satan may not accuse thee concerning the calf that thou madest at Horeb; and take a ram for the burnt sacrifice, that there may be a memorial for thee of the righteousness of Izhak whom his father bound as a ram on the mountain of worship, both of them shall be perfect, and bring them before the Lord.