Cyril of Alexandria

The gathering of the common people, having heard what had happened, were readily persuaded by those who bare witness that the Christ had raised Lazarus to life, and annulled the power of death, as the prophets said: for this cause also they went and met Him.

Commentary On The Gospel Of John 8 ↗

Theophylact of Ohrid

See then the consequences of our Lord's passion. It was not to no purpose that He had reserved His greatest miracle for the last. For the resurrection of Lazarus it was that made the crowd believe in Him. The people therefore that was with Him when He called Lazarus out of his grave, and raised him from the dead, bare record. For this cause the people also met Him, for that they heard that He had done this miracle. …

Catena Aurea by Aquinas ↗

Augustine of Hippo

"The people, therefore, that was with Him when He called Lazarus out of his tomb, and raised him from the dead, bare record. For this cause the crowd also met Him, for that they heard that He had done this miracle. The Pharisees, therefore, said among themselves: Perceive ye that we prevail nothing? Behold, the whole world is gone after Him." Mob set mob in motion. "But why art thou, blinded mob that thou art, filled with envy because the world has gone after its Maker?"

Tractates on John 51 ↗

Thomas Aquinas

Then he mentions why the crowd went to meet Jesus, which was to bear witness. This was done by the crowd that had been with him, at the resurrection of Lazarus, when he called Lazarus out of the tomb and raised him from the dead.

Commentary on John ↗

Bonaventure

Therefore the crowd bore witness, etc. Here the third point is touched upon, namely the reason for the honor shown: and this was the very wondrous raising of Lazarus, which was well known to the crowds: on account of which he says: Therefore the crowd that was with him bore witness to him, when he called Lazarus from the tomb and raised him from the dead, saying: "Lazarus, come forth." This crowd bore witness to his omnipotence, namely the crowd of the simple and also the crowd of the wise: of the wise, Acts 10: "To him all the …

Commentary on John, Chapter 12 ↗