First Reading 1 Cor 9:16-19, 22-23
For if I preach the gospel, it is no glory to me, for a necessity lieth upon me: for woe is unto me if I preach not the gospel. For if I do this thing willingly, I have a reward: but if against my will, a dispensation is committed to me: What is my reward then? That preaching the gospel, I may deliver the gospel without charge, that I abuse not my power in the gospel. For whereas I was free as to all, I made myself the servant of all, that I might gain the more.
To the weak I became weak, that I might gain the weak. I became all things to all men, that I might save all. And I do all things for the gospel's sake: that I may be made partaker thereof.
Responsorial Psalm Ps 96:1-2a, 2b-3, 7-8a, 10
A canticle for David himself, when the house was built after the captivity. Sing ye to the Lord a new canticle: sing to the Lord, all the earth. Sing ye to the Lord and bless his name: shew forth his salvation from day to day.
Sing ye to the Lord and bless his name: shew forth his salvation from day to day. Declare his glory among the Gentiles: his wonders among all people.
Bring ye to the Lord, O ye kindreds of the Gentiles, bring ye to the Lord glory and honour: bring to the Lord glory unto his name. Bring up sacrifices, and come into his courts:
Say ye among the Gentiles, the Lord hath reigned. For he hath corrected the world, which shall not be moved: he will judge the people with justice.
Gospel Matt 16:13-19
And Jesus came into the quarters of Caesarea Philippi: and he asked his disciples, saying: Whom do men say that the Son of man is? But they said: Some John the Baptist, and other some Elias, and others Jeremias, or one of the prophets. Jesus saith to them: But whom do you say that I am? Simon Peter answered and said: Thou art Christ, the Son of the living God. And Jesus answering, said to him: Blessed art thou, Simon Bar-Jona: because flesh and blood hath not revealed it to thee, but my Father who is in heaven. And I say to thee: That thou art Peter ; and upon this rock I will build my church, and the gates of hell shall not prevail against it. And I will give to thee the keys of the kingdom of heaven. And whatsoever thou shalt bind upon earth, it shall be bound also in heaven: and whatsoever thou shalt loose upon earth , it shall be loosed also in heaven.