Philip found Nathanael and told him, “We have found the One Moses wrote about in the Law (and so did the prophets): Jesus the son of Joseph, from Nazareth!”
Philip and Nathanael apparently read their Old Testament and saw in it the promise of a Messiah. Remember just back in the last chapter of Luke we read that Jesus walked some disciples through this very same thing: Moses and the prophets pointing to Jesus.
Then beginning with Moses and all the Prophets, He interpreted for them the things concerning Himself in all the Scriptures.
All of Scripture leaves us hoping for the provision of a Savior.
Whether it’s the OT or the NT, the point and application is often the same: place your faith in the One who has done it all for you.