'Opening' in the Bible

So they entered the house; and when they saw the babe with His mother Mary, they prostrated themselves and did Him homage, and opening their treasure-chests offered gifts to Him--gold, frankincense, and myrrh.

and immediately on His coming up out of the water He saw an opening in the sky, and the Spirit like a dove coming down to Him;

Finding themselves unable, however, to bring him to Jesus because of the crowd, they untiled the roof just over His head, and after clearing an opening they lowered the mat on which the paralytic was lying.

And there was handed to Him the book of the Prophet Isaiah, and, opening the book, He found the place where it was written,

but through an opening in the wall I was let down in a basket, and so escaped his hands.

In a fountain, are fresh water and bitter sent forth from the same opening?