Hebrews 1:1

Here the apostle begins with a general declaration of the excellency of the gospel dispensation above that of the law, which he demonstrates from the different way and manner of God's communicating himself and his mind and will to men in the one and in the other: both these dispensations were of God, and both of them very good, but there is a great difference in the way of their coming from God. Observe, I. The way wherein God communicated himself and his will to men under the Old Testament. We have here an account, 1. Of the persons by whom God delivered his mind under the Old Testament; they were the prophets, that is, persons chosen of God, and qualified by him, for that office of revealing the will of God to men. No man takes this honour to himself, unless called; and whoever are called of God are qualified by him. 2. The persons to whom God spoke by the prophets: To the fathers, to all the Old Testament saints who were under that dispensation. God favoured and honoured them with much clearer light than that of nature, under which the rest of the world were left. 3. The order in which God spoke to men in those times that went before the gospel, those past times: he spoke to his ancient people at sundry times and in divers manners. (1.

— Matthew Henry's Concise Commentary (public domain)