ISB ~ Hebrews 9 v12

once for all:In marked contrast to the “once a year” (9:7) entrance of the high priests of Israel (9:25).

Holy Place:The Greek is better rendered “sanctuary”, as in 8:2 and 9:24.

blood of goats and calves:The author appears to telescope two different liturgical events: the ratification of the Mosaic covenant at Sinai, where the Greek OT specifies that young calves were sacrificed (Ex 24:5), and the renewal of the Mosaic covenant on the Day of Atonement, when a goat was sacrificed for the transgressions of the people (Lev 16:15). The effect is to show that the sacrificial blood of Christ both ratifies a New Covenant and truly atones for the sins committed under the Old (Heb 9:15) (CCC 592). For a similar use of this technique, See note on Heb 7:27.