Jamieson, Fausset & Brown

For--The sacrifice being "for ever" in its efficacy (Heb 10:12) needs no renewal. them that are sanctified--rather as Greek, "them that are being sanctified." The sanctification (consecration to God) of the elect (Pe1 1:2) believers is perfect in Christ once for all (see on Heb 10:10). (Contrast the law, Heb 7:19; Heb 9:9; Heb 10:1). The development of that sanctification is progressive.