Isaiah 22: 19-23
Through the prophet Isaiah the Lord entrusts to Eliakim the key of the House of David. 

Romans 11:33-36
St. Paul affirms that, although ultimately beyond our comprehension, God is the source of everything and the focus of all glory. 

Matthew 16: 13-20
Simon Peter proclaims that Jesus is the Christ, the Son of the living God; Jesus confirms Peter as the rock on which he will build his Church, assigning to him the keys of the kingdom of heaven.