Matthew 21:16
And they said to him: do you hear what these are saying? And Jesus said to them: yes; have you never read, out of the mouth of infants and nursing babies you have prepared praise? The Psalm 8:2 quotation — the praise of God prepared from the mouths of infants — is Jesus' defense of the children's acclamation. The have you never read challenge places the burden on the Scripturally expert chief priests and scribes who should have recognized the psalm. The children's praise is exactly what the psalm promised — and the religious authorities who object to it have missed the Scripture.