First Reading Isaiah 22:19-23

19I will thrust you from your office, and you will be cast down from your station. 20In that day I will call my servant Eli'akim the son of Hilki'ah, 21and I will clothe him with your robe, and will bind your girdle on him, and will commit your authority to his hand; and he shall be a father to the inhabitants of Jerusalem and to the house of Judah. 22And I will place on his shoulder the key of the house of David; he shall open, and none shall shut; and he shall shut, and none shall open. 23And I will fasten him like a peg in a sure place, and he will become a throne of honor to his father's house.

Responsorial Psalm Psalms 138:1-3, 6, 8

1I give thee thanks, O LORD, with my whole heart; before the gods I sing thy praise; 2I bow down toward thy holy temple and give thanks to thy name for thy steadfast love and thy faithfulness; for thou hast exalted above everything thy name and thy word. 3On the day I called, thou didst answer me, my strength of soul thou didst increase. 6For though the LORD is high, he regards the lowly; but the haughty he knows from afar. 8The LORD will fulfil his purpose for me; thy steadfast love, O LORD, endures for ever. Do not forsake the work of thy hands.

Second Reading Romans 11:33-36

33O the depth of the riches and wisdom and knowledge of God! How unsearchable are his judgments and how inscrutable his ways! 34"For who has known the mind of the Lord, or who has been his counselor?" 35"Or who has given a gift to him that he might be repaid?" 36For from him and through him and to him are all things. To him be glory for ever. Amen.

Gospel Matthew 16:13-20

13Now when Jesus came into the district of Caesare'a Philip'pi, he asked his disciples, "Who do men say that the Son of man is?" 14And they said, "Some say John the Baptist, others say Eli'jah, and others Jeremiah or one of the prophets." 15He said to them, "But who do you say that I am?" 16Simon Peter replied, "You are the Christ, the Son of the living God." 17And Jesus answered him, "Blessed are you, Simon Bar-Jona! For flesh and blood has not revealed this to you, but my Father who is in heaven. 18And I tell you, you are Peter, and on this rock I will build my church, and the powers of death shall not prevail against it. 19I will give you the keys of the kingdom of heaven, and whatever you bind on earth shall be bound in heaven, and whatever you loose on earth shall be loosed in heaven." 20Then he strictly charged the disciples to tell no one that he was the Christ.