Matthew 18:18 repeats the binding/loosing promise to all disciples—extending the authority given to Peter.

In Isaiah 22:22, the key of David symbolizes authority — typologically fulfilled when Jesus gives Peter the keys of the kingdom.

John 20:23 gives the disciples authority to forgive sins—a specific application of the binding/loosing authority given to Peter.

In Acts 2:14-42, Peter uses the keys to open the kingdom to Jews — fulfilling Jesus' promise of the keys.

In Acts 10:34-43, Peter opens the kingdom to Gentiles — again using the keys given by Jesus.

In Revelation 1:18, Jesus holds the keys of death — showing that the keys given to Peter derive from Christ's ultimate authority.

Revelation 3:7 attributes the key of David to Christ—the ultimate authority to open and shut that Peter's keys represent.

In Acts 15:7, Peter recalls God using him to open the door to Gentiles — directly linked to the keys of the kingdom.