Luke 19:40
He answered them, "I tell you that if these were silent, the stones would cry out."
WEB
And he answered and said unto them, I tell you that, if these should hold their peace, the stones would immediately cry out.
KJV
What Luke 19:40 means
As Jesus rides into Jerusalem to the crowd's praise, religious leaders tell him to silence his followers, and he replies that if they went quiet, even the stones would cry out.
This comes at the start of what is often called the Triumphal Entry. Jesus is riding into Jerusalem, and a crowd of his followers is loudly praising God for everything they have seen him do. Some of the religious leaders in the crowd are uncomfortable and tell him to make his disciples stop. His answer is that if the people fell silent, the stones themselves would cry out.
It is a vivid way of saying that the truth breaking into view cannot be hushed by an order to stop. The crowd is responding to something real. Force the human voices quiet, and creation itself would still testify. Some things are true whether or not anyone is allowed to say them.