The Gospel in the Old Testament: Acts 9:20-22
“20) and immediately he began to proclaim Jesus in the synagogues, saying, “He is the Son of God.” 22) But Saul kept increasing in strength and confounding the Jews who lived at Damascus by proving that this Jesus is the Christ.” Acts‬ ‭9‬:‭20‬, ‭22‬ ‭
I tied these two verses together to prove a point: it is possible to share the gospel from the Old Testament. Because Saul was a biblical scholar, the Holy Spirit opened His eyes to see the message of Jesus concealed in the Old Testament.
2 Corinthians 3:12-18 argues this point. A blinder is over the eyes of the Jewish people when the read the Old Testament, but whenever a person turns to the Lord, it is taken away. Suddenly they can see Jesus in every story, type, form and shadow. Many Old Testament prophecies are about Him. The anointing of the Holy Spirit causes the Bible to come alive.
I believe the books of Romans, Galatians and Hebrews are prime examples of how Paul used the Old Testament to prove that Jesus is the Son of God and and preach the gospel to Jewish people. He became a mighty evangelist and biblical apologist. These books are a master piece for every believer to study related to how to preach the gospel from the Old Testament.
Daily Bible Commentary By Terry Baxter: Cofounder of GoServ Global