'Opening' in the Bible

And [when they] came into the house, they saw the child with Mary his mother, and they fell down [and] worshiped him. And opening their treasure boxes, they offered him gifts of gold and frankincense and myrrh.

And opening his mouth he began to teach them, saying,

and for me, that a word may be given to me at the opening of my mouth, to make known with boldness the mystery of the gospel,

A spring does not pour forth from the same opening fresh and bitter [water, does it]?