CCC 1444 In imparting to his apostles his own power to forgive sins the Lord also gives them the authority to reconcile sinners with the Church. This ecclesial dimension of their task is expressed most notably in Christ’s solemn words to Simon Peter: “I 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.”1 “The office of binding and loosing which was given to Peter was also assigned to the college of the apostles united to its head.”2
1 Mt 16:19; cf. Mt 18:18; 28:16-20.
2 LG 22 # 2.