Hebrews 12:25

“See that ye refuse not him that speaketh, etc..] Jesus, the Mediator of the new covenant, whose blood speaks better things than Abel, or than his blood and sacrifice: he was the speaker in the council and covenant of grace, that spoke for the elect; in the creation of all things out of nothing, that said, and it was done; in giving the law to the Israelites, in the wilderness, for he is the angel which spake to Moses in Mount Sinai, he spoke to God for the Old Testament saints, and was the angel of God's presence to them; he spoke in his own person, as the prophet of the church, in the days of his flesh; and he now speaks in heaven, by appearing in the presence of God for his people, and by…”

“refuse not--through unbelief. him that speaketh--God in Christ. As the blood of sprinkling is represented as speaking to God for us, Heb 12:24; so here God is represented as speaking to us (Heb 1:1-2). His word now is the prelude of the last "shaking" of all things (Heb 12:27). The same word which is heard in the Gospel from heaven, will shake heaven and earth (Heb 12:26). who refused him--Greek, "refusing as they did." Their seemingly submissive entreaty that the word should not be spoken to them by God any more (Heb 12:19), covered over refractory hearts, as their subsequent deeds showed (Heb 3:16). that spake--revealing with oracular warnings His divine will: so the Greek. if we turn…”

“See that ye refuse not - That you do not reject or disregard. Him that speaketh - That is, in the gospel. Do not turn away from him who has addressed you in the new dispensation, and called you to obey and serve him. The meaning is, that God had addressed “them” in the gospel as really as he had done the Hebrews on Mount Sinai, and that there was as much to be dreaded in disregarding his voice now as there was then. He does not speak, indeed, amidst lightnings, and thunders, and clouds, but he speaks by every message of mercy; by every invitation; by every tender appeal. He spake by his Son Hebrews 1:1; he speaks by the Holy Spirit, and by all his calls and warnings in the gospel. For if…”

“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. Hebrews 12:26”

“12:25-29 As the final warning in the book (see 2:1-4; 4:12-13; 6:4-8; 10:26-31), this passage plays off the image of God speaking in 12:18-24. 12:25 God is the One who is speaking his revealed word in his Son, Jesus (1:1-3). The author argues from lesser to greater (see study note on 9:14): Moses’ warning the people under the old covenant is the lesser situation, and God’s warning us from heaven is the greater situation. If people did not escape judgment when they were warned by Moses, those who reject the message of the Son of God will certainly not escape punishment.”

“See: Heb 8:5; Exo 16:29; Kg1 12:16; Isa 48:6, Isa 64:9; Mat 8:4; Th1 5:15; Pe1 1:22; Rev 19:10, Rev 22:9 refuse: Pro 1:24, Pro 8:33, Pro 13:18, Pro 15:32; Jer 11:10; Eze 5:6; Zac 7:11; Mat 17:5; Act 7:35 if they: Heb 2:1-3, Heb 3:17, Heb 10:28, Heb 10:29 turn away: Num 32:15; Deu 30:17; Jos 22:16; Ch2 7:19; Pro 1:32; Ti2 4:4 Hebrews 12:26”