Matthew 21:15-16

15But when the chief priests and the teachers of the law saw the wonderful things he did and the children shouting in the temple courts, “Hosanna to the Son of David,” they were indignant.

16“Do you hear what these children are saying?” they asked him. “Yes,” replied Jesus, “have you never read, “ ‘From the lips of children and infants you, Lord, have called forth your praise’ Psalm 8:2 (see Septuagint) ?”