LXX Num 8:12

οἱ δὲ Λευεῖται ἐπιθήσουσιν τὰς χεῖρας ἐπὶ τὰς κεφαλὰς τῶν μόσχων, καὶ ποιήσει τὸν ἕνα περὶ ἁμαρτίας καὶ τὸν ἕνα εἰς ὁλοκαύτωμα κυρίῳ, ἐξιλάσασθαι περὶ αὐτῶν.

And the Levites are to lay their hands on the heads of the bulls, and offer to the LORD one as a sin offering and the other as a burnt offering, to make atonement for the Levites.