They that heard entreated, etc. This is the second clause, in which he shows that the Law was very different from the Gospel; for when it was promulgated there was nothing but terrors on every side. For everything we read of in the nineteenth chapter of Exodus was of this kind, and intended to show to the people that God had ascended his tribunal and manifested himself as a strict judge. If by chance an innocent beast approached, he commanded it to be killed: how much heavier punishment awaited sinners who were conscious of their guilt, nay, who knew themselves to be condemned to eternal death by the Law? But the Gospel contains nothing but love, provided it be received by faith. What remains to be said you may read in the third chapter of the Second Epistle to the Corinthians. But by the words the people entreated, etc., is not to be understood that they refused to hear God, but that they prayed not to be constrained to hear God himself speaking; for by the interposition of Moses their dread was somewhat mitigated. [1] Yet interpreters are at a loss to know how it is that the Apostle ascribes these words to Moses, I exceedingly fear and quake; for we read nowhere that they were expressed by Moses. But the difficulty may be easily removed, if we consider that Moses spoke thus in the name of the people, whose requests as their delegate he brought to God. It was, then, the common complaint of the whole people; but Moses is included, who was, as it were, the speaker for them all. [2]

Footnotes

1 - The words at the end of verse 20, "or thrust through with a dart," are not deemed genuine, being not found in the best MSS., and none of any authority containing them. -- Ed.

2 - It is supposed by some that the reference here is to what is found in Exodus 19:16, 17. It is said in the former verse that all the people in the camp trembled; and it is concluded that Moses was at the time with them, for it is said in the next verse that he brought them forth out of the camp. But the passage that seems most evidently to intimate what is here said in the 19th verse, where we are told, that when the trumpet sounded long, and waxed louder and louder. "Moses spake" and that "God answered him by a voice." Now we are not told what he said, nor what the answer was which God gave. It is however, natural to conclude, that under the circumstances mentioned, Moses expressed his fears, and that God removed them. --Ed.

And the voice of a trumpet - Exodus 19:19. The sound of the trumpet amidst the tempest was suited to increase the terror of the scene.
And the voice of words - Spoken by God; Exodus 19:19. It is easy to conceive what must have been the awe produced by a voice uttered from the midst of the tempest so distinct as to be heard by the hundreds of thousands of Israel, when the speaker was invisible.
Which voice they that heard - Exodus 20:18-19. It was so fearful and overpowering that the people earnestly prayed that if they must be addressed, it might he by the familiar voice of Moses and not by the awful voice of the Deity.

And the sound of a trumpet,.... Exodus 19:16, which made it still more awful, as the sound of the trumpet will at the last day:
and the voice of words; of the ten words, or decalogue; which was as an articulate voice, formed by angels; and, therefore, the law is called the word spoken by angels, Hebrews 2:2 and is represented, as the voice of God himself, Exodus 20:1 who made use of the ministry of angels to deliver the law to Moses; "which" voice is called , "the voice of words", in Deuteronomy 4:12, and this voice,
they that heard, entreated that the word should not be spoken to them any more: fearing that they should die; wherefore they desired Moses to be their mediator, and draw nigh to God, and hear his words, and speak them to them, from him, Exodus 20:19.

trumpet--to rouse attention, and herald God's approach (Exodus 19:16).
entreated that the word should not be spoken--literally, "that speech should not be added to them"; not that they refused to hear the word of God, but they wished that God should not Himself speak, but employ Moses as His mediating spokesman. "The voice of words" was the Decalogue, spoken by God Himself, a voice issuing forth, without any form being seen: after which "He added no more" (Deuteronomy 5:22).

The sound of a trumpet - Formed, without doubt, by the ministry of angels, and preparatory to the words, that is, the Ten Commandments, which were uttered with a loud voice, Deuteronomy 5:22.