Hebrews 2:3

3.If we neglect so great a salvation, etc. Not only the rejection of the Gospel, but also its neglect, deserves the heaviest punishment, and that on account of the greatness of the grace which it offers; hence he says, so great a salvation. God would indeed leave his gifts valued by us according to their worth. Then the more precious they are, the baser is our ingratitude when we do not value them. In a word, in proportion to the greatness of Christ will be the severity of God’s vengeance on all the despisers of his Gospel. (30)

And observe that the word salvation is transferred here metonymically to the doctrine of salvation; for as the Lord would not have men otherwise saved than by the Gospel, so when that is neglected the whole salvation of God is rejected; for it is God’s power unto salvation to those who believe. (Romans 1:16.) Hence he who seeks salvation in any other way, seeks to attain it by another power than that of God; which is an evidence of extreme madness. But this encomium is not only a commendation of the Gospel, but is also a wonderful support to our faith; for it is a testimony that the word is by no means unprofitable, but that a sure salvation is conveyed by it. (31)

Which at first began, etc. Here he sets the Son of God, the first herald of the Gospel, in opposition to angels, and also anticipates what was necessary to remove a doubt which might have crept into the minds of many; for they had not been taught by the mouth of Christ himself, whom the greatest part had never seen. If then they regarded only the man by whose ministry they had been led to the faith, they might have made less of what they had learnt from him; hence the Apostle reminded them, that the doctrine which had been delivered them by others, yet proceeded from Christ; for he says that those who had faithfully declared what had been committed to them by Christ, had been his disciples. He therefore uses the word, was confirmed, as though he had said, that it was not a random report, without any author, or from witnesses of doubtful credit, but a report which was confirmed by men of weight and authority.

Moreover, this passage indicates that this epistle was not written by Paul; for he did not usually speak so humbly of himself, as to confess that he was one of the Apostles’ disciples, nor did he thus speak from ambition, but because wicked men under a pretense of this kind attempted to detract from the authority of his doctrine. It then appears evident that it was not Paul who wrote that he had the Gospel by hearing and not by revelation. (32)