>>20515
Matthew 16:18-19 Revised Standard Version (RSV)
>18 And I tell you, you are Peter,[a] and on this rock[b] I will build my church, and the powers of death[c] shall not prevail against it. 19 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.”
From wikipedia
>Binding and loosing is originally a Jewish phrase appearing in the New Testament, as well as in the Targum. In usage, to bind and to loose simply means to forbid by an indisputable authority and to permit by an indisputable authority.
The Pope isnt infallible in everything he does or says, only in very special circumstances when the Holy Spirit inspires him. The Pope is still a fallen, fallible human.