The Cornerstone
Stones dressed for a building, one set aside, then laid at the corner, and the walls of living stones rising from it. Scroll to watch it.
The stone which the builders rejected, the same is become the head of the corner. This is done by the Lord, and it is wonderful in our eyes.
Psalm 118:22-23, as St Cyprian of Carthage gives it
behold I cast down for the foundations of Zion a stone, precious, elect, a corner-stone, honourable.
Isaiah 28:16, as Barnabas gives it
As then in other places He has been called the foundation and coping-stone by the voice of the prophets, for upon Him we are built up, ourselves being the stones, living and spiritual stones, into a holy priesthood for a habitation of God in the Spirit
Cyril of Alexandria, Commentary on John Book X