Mt 21:15-16

In the Old Testament, it was foretold that God would give power to the mouths of children and infants to silence the enemies of Christ. (Psalm 8:2)

Psalm 8:2 Out of the mouth of babes and sucklings hast thou ordained strength because of thine enemies, that thou mightest still the enemy and the avenger.

Jesus quoted the Old Testament and told the chief priests and scribes that it had been fulfilled for the children to welcome himself as the Son of David, the Christ. (Mt 21:15-16)

Mt 21:15 And when the chief priests and scribes saw the wonderful things that he did, and the children crying in the temple, and saying, Hosanna to the son of David; they were sore displeased, 16 And said unto him, Hearest thou what these say? And Jesus saith unto them, Yea; have ye never read, Out of the mouth of babes and sucklings thou hast perfected praise?