On the day of atonement, on the tenth of the seventh month, a similar festal sacrifice was to be offered to the one presented on the seventh new moon's day (a burnt-offering and sin-offering), in addition to the sin-offering of atonement prescribed at Lev 16, and the daily burnt-offerings. For a more minute description of this festival, see at Lev 16 and Lev 23:26-32.