'Opening' in the Bible

As he was observing a well that had been dug out on the open range, all of a sudden he noticed three flocks of sheep lying there, because shepherds watered their flocks from that well. There was a very large stone that covered the opening of the well,

and when all the flocks had been gathered there, they would roll away the stone from the opening of the well, water their flocks, and then return the stone to its place covering the opening of the well.

But they responded, "We can't do that until all the sheep have been gathered and the stone has been rolled away from the opening of the well. Only then can we water the flock."

When Jacob saw Rachel, the daughter of Laban, his mother's brother, accompanied by Laban's sheep, Jacob approached the well, rolled the stone from the opening of the well, and then watered his mother's brother Laban's flock.