Charles Ellicott Commentary Hebrews 10:28

"A man that hath set at nought Moses law dieth without compassion on [the word of] two or three witnesses:" — Hebrews 10:28 (ASV)

He that despised Moses’ law.—Rather, A man that has treated with contempt a law of Moses dies without pity before two or three witnesses. The reference is to Deuteronomy 17:2-7, with the last words—before two or three witnesses—being a direct quotation from Hebrews 10:6 in that section. There the subject is apostasy from Jehovah to the worship of idols. That sin, which by the acknowledgment of all had in ancient times robbed Israel of the name of God’s people, is tacitly placed beside the sin of those who forsake Christ. It will be seen how impressively the thought of the last verse is maintained in this.