ISB ~ Matthew 18 v18

whatever you bind … loose:In 16:19, Peter was invested with Christ’s authority as the visible head of the Church. A derivative—but subordinate—authority is given also to the apostles as royal ministers in the kingdom. Jesus’ authority in this context is related to Church discipline; by extension, it is also a sacramental authority to forgive sins (cf. Jn 20:23; CCC 553, 1444). See notes on Mt 9:8 and 16:19.