God preached the gospel to Abraham

Galatians 3:5-9

New King James Version (NKJV)

⁵ Therefore He who supplies the Spirit to you and works miracles among you, does He do it by the works of the law, or by the hearing of faith?— ⁶ just as Abraham “believed God, and it was accounted to him for righteousness.”^{[a] 7} Therefore know that only those who are of faith are sons of Abraham. ⁸ And the Scripture, foreseeing that God would justify the Gentiles by faith, preached the gospel to Abraham beforehand, saying, “In you all the nations shall be blessed.”^{[b] 9} So then those who are of faith are blessed with believing Abraham.