The Logos blog has a helpful piece from Murray J. Harris on the meaning of the terms “bind” and “loose” in Matthew 16:19. When Jesus entrusts to Peter the “keys of the kingdom,” along with the authority to bind and loose, to what is he referring?
Whenever evangelists affirm that all those who repent and believe in Jesus Christ have their sins forgiven, they are declaring that such people are “loosed” and have entered the kingdom. In this declaration, they are dramatizing on earth the standing verdict that heaven (= God) has already made. Similarly, those who remain unrepentant unbelievers are “bound,” and the kingdom is shut against them. Heaven has already affirmed this truth, for “salvation is found in no one else” than Jesus the Cornerstone (Acts 4:11–12).
Harris makes his case from the context of Matthew and other ancient Jewish literature. He models good contextual work to help answer a thorny question, and he draws useful implications for what this does and doesn’t mean for churches and church leaders today.