Luke 19:39

‘And some of the Pharisees from the crowd said to him, “Teacher, rebuke your disciples.” '

The Pharisees did not like what they were hearing, and they called on Jesus to rebuke these who were shouting out. It may have been concern for His and their safety. It may have been because they did not like such ascriptions being made to the Prophet with Whom they were at disagreement, and were seeking to calm the fervour, feeling that Jesus could not want it also, as it was surely going too far. It was one thing for pilgrims to be received with general cries which were just the product of the festal mood, it was quite another when it was apparent that a number of them were possibly taking their ascriptions seriously.