Which Gospel are you referring to?
Abraham believed what God told him, and acted accordingly. The faith of Abraham to God, and what God told him, was accounted to him as righteousness.
We are to have the same kind of faith in God as Abraham had. Even so, what God revealed to Abraham was the Gospel (Good News) to him, but was not the same Good News that Christians possess, and by which we are saved, in the New Covenant.
1 Peter 1:10-12 (WEB)
10 Concerning this salvation, the prophets sought and searched diligently. They prophesied of the grace that would come to you, 11 searching for who or what kind of time the Spirit of Christ, which was in them, pointed to, when he predicted the sufferings of Christ, and the glories that would follow them. 12 To them it was revealed, that they served not themselves, but you, in these things, which now have been announced to you through those who preached the Gospel to you by the Holy Spirit sent out from heaven; which things angels desire to look into.