The gospels emphasize the genuine popularity of Jesus. He is recognized by the crowd, and everyone wants not only to hear Him, but even to touch Him! For His part, Jesus heals them and ensures that the glory goes to God.
The people thus become witnesses themselves of what He did among them. The apostles are the only inspired witnesses, but they are not the only witnesses.
Acts 2:22Men of Israel, hear these words: Jesus of Nazareth, a man attested to you by God with mighty works and wonders and signs that God did through him in your midst, as you yourselves know….
The entire nation of Israel at that time saw what was happening when Jesus was among them. At the start of the Law, God had called them a 'kingdom of priests,' indicating they would become the teachers of other nations. Matthew's quotation from Isaiah makes plain that the Lord's Servant will gain fame among all nations, not just Israel. The coming of Jesus Christ, the Son of God, therefore fulfills Israel's destiny to share the blessings of Abraham with the world.
Exodus 19:6…you shall be to me a kingdom of priests and a holy nation….
Acts 26:26…I am persuaded that none of these things has escaped his notice, for this has not been done in a corner.