Hebrews 10:18 - Matthew Poole's English Annotations on the Holy Bible

The Spirit having cleared his assumption before, now concludes; Whereas perfect forgiveness of sins is from God's grace, by the one sacrifice of his Son once offered, acquired and effected for penitent believers for ever, as the promise voucheth, Jeremiah 31:34: For he will in no wise remember their sins, but will forgive them for ever; therefore there needs no repetition of that sacrifice again, or of any other for sin. But the Hebrews had the highest reason now to desert the legal sacrifices, and to rest upon and to cleave to his alone, any being, use, or consistency of such, after the effect of Christ's one sacrifice, being vain; for all being completed in his, it is but just theirs should cease from them.