28 Anyone who rejected the law of Moses died without mercy on the testimony of two or three witnesses.

Read Hebrews 10:28 Using Other Translations

He that despised Moses' law died without mercy under two or three witnesses:
Anyone who has set aside the law of Moses dies without mercy on the evidence of two or three witnesses.
For anyone who refused to obey the law of Moses was put to death without mercy on the testimony of two or three witnesses.