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Matthew 18:18
ESV - 18 Truly, I say to you, whatever you bind on earth shall be bound in heaven, and whatever you loose on earth shall be loosed in heaven.
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Whoever knows and belives in Jesus as Peter did,(Mathew 16: 16-17) will become the children of God (John 1: 12-13), an ambassador of the kingdom of heaven to the world.
I have a NAS Bible and, thinking about the other gospels as well, I understand that it means: retaining and forgiveness of sins.