'Scriptures' in the Bible

"Have you never read in the Scriptures," said Jesus, "'The Stone which the builders rejected has been made the Cornerstone: this Cornerstone came from the Lord, and is wonderful in our eyes'?

The reply of Jesus was, "You are in error, through ignorance of the Scriptures and of the power of God.

In that case how are the Scriptures to be fulfilled which declare that thus it must be?"