Q: How could the disciples recognize Jesus even though His name is not found in the Old Testament?
A: The name “Jesus” is not recorded in the Old Testament. Even if the name “Jesus” was in the Old Testament, people would not believe in Him just because His name is Jesus. For example, 2,000 years ago “Jesus” was a common name in Israel (Col 4:11). Therefore, the name “Jesus” alone is not enough evidence to testify to the Christ.
The only way to believe in Jesus is through the prophecies He fulfilled. The Old Testament prophets said the messiah would be born of a virgin (Isa 7:14), and that he would be born in Bethlehem (Mic 5:2). Matthew testified that Jesus indeed fulfilled those prophecies (Mt 2:1–6; Mt 1:18–23). Apostle Peter testified about Jesus with the Bible, and as a result 3,000 people were baptized (Ac 2:14–36). The Treasurer of Ethiopia received baptism immediately after Philip testified about Jesus with the scriptures (Ac 8:26–35). Apostle Paul testified about Christ with the Scriptures (Ac 17:2–3; 28:23).
In summary, Jesus’ deeds were already recorded hundreds of years before he was born. By fulfilling the prophecies, the disciples recognized Jesus as the Christ. It’s the same with Christ’s second coming. Only the people who believe the prophecies in the Bible will receive Him.