The "FIRMAMENT" separates the "waters above" from the "waters below". Revelation tells us the "waters", where the PROSTITUTE sits, stands for people.
As it was in the days of Noah, so it will be at the coming of the Son of Man.
Jesus told them what they bind on earth will be bound in Heaven, and what the loose on earth will be loosed in Heaven. Jesus prayed that we be One.
Heaven and earth will pass away, but His words will never pass away.