New Defender's Study Bible Notes
4:2 the gospel. The “gospel” is not just a New Testament revelation, for it was preached to the children of Israel in the wilderness, in types and prophecies at least. In fact, it is “the everlasting gospel” (Revelation 14:6-7), and the first promise of redemption (Genesis 3:15) is commonly known as the protevangel (first gospel). In its essence, the gospel (good news) is the message that the Creator is also our Redeemer and coming King and that true faith in Him—faith which produces salvation—will also produce loving obedience to His Word.
4:2 mixed with faith. It is vital to “hear” the Word, but then it is necessary to “believe” it as well. Note John 5:24; James 1:22.