And they said, We cannot,—not because of any physical difficulty (Kalisch), since three men could easily have accomplished what Jacob by himself did, but because they had agreed not to do so (Rosenmüller, Murphy), but to wait—until all the flocks be gathered together (when the watering was done at once, instead of at so many different times), and till they roll the stone from the well's mouth;—more correctly rendered, and (sc.
then, i.e. when the flocks are assembled) they (i.e. the shepherds) roll away the stone—then (or, and) we water the sheep. The object of watering the flocks collectively may have been, as above stated, for convenience, or to prevent the well from being opened too frequently, in which case dust might rapidly accumulate within it (Kalisch), or perhaps to secure an equal distribution of the water (Murphy).