John writes in the 12th chapter of his Gospel:
Many Jews learned that he was there. They came not only because of Jesus but also to see Lazarus, whom he had raised from the dead. The chief priests decided that they would kill Lazarus too. It was because of Lazarus that many of the Jews had deserted them and come to believe in Jesus.
The next day the great crowd that had come for the festival heard that Jesus was coming to Jerusalem. They took palm branches and went out to meet him. They shouted, 'Hosanna! Blessings on the one who comes in the name of the Lord! Blessings on the king of Israel!'
Jesus found a young donkey and sat on it, just as it is written, 'Don’t be afraid, Daughter Zion. Look! Your king is coming, sitting on a donkey’s colt.'