They filled in with sand all of the wells that Isaac's father Abraham's servants had dug during his lifetime.

Isaac re-excavated some wells that his father had first dug during his lifetime, because the Philistines had filled them with sand after Abraham's death. Isaac renamed those wells with the same names that his father had called them.

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.