“See that ye refuse not him that speaketh. For if they escaped not who refused him that spake on earth, much more shall not we escape, if we turn away from him that speaketh from heaven:”
King James Version (KJV)
12:25 Refuse not - By unbelief. Him that speaketh - And whose speaking even now is a prelude to the final scene. The same voice which spake both by the law and in the gospel, when heard from heaven, will shake heaven and earth. For if they escaped not - His vengeance. Much more shall not we - Those of us who turn from him that speaketh from heaven - That is, who came from heaven to speak to us.
Heb 12:25 See that ye refuse not him that speaketh. The whole Old Testament shows that those who refused to listen to God's message delivered by men did not escape. How can those escape then who refuse to listen to God's own Son?