Thematic Bible: Often covered to prevent their being filled with sand

And as he looked about, behold there was a well in the field, and three flocks of sheep lay thereby - for at that well were the flocks watered - and there lay a great stone at the well mouth. And the manner was to bring the flocks thither, and to roll the stone from the well's mouth and to water the sheep, and to put the stone again upon the well's mouth unto his place.