ISB ~ Hebrews 7 v27

daily … his own sins:The author appears to telescope the daily sacrifices offered by priests every morning and evening (Num 28:1-8) and the annual sacrifices of the Day of Atonement, which the high priest offered for the sins of Israel, including his own (Lev 16:11-19). This is in contrast to Christ, who offered only one sacrifice, and that for his people and not for himself. For a similar use of this technique, see note on Heb 9:12.

once for all:Several times Hebrews stresses how the single sacrifice of Jesus is definitive and unrepeatable (9:12, 26) (CCC 1085).