The Tosefta deduced from the contrast between the plenty indicated in and the famine indicated in that God gave the people food and drink and a glimpse of the world to come while the righteous Abraham was alive, so that the people might understand what they had lost when he was gone. The Tosefta reported that when Abraham was alive, the wells gushed forth water, but the Philistines filled the wells with earth (as reported in ), for after Abraham died the wells no longer gushed forth water, and the Philistines filled them so that they would not provide cover for invaders. But when Isaac came along, the wells gushed water again (as indicated in ) and there was plenty again (as indicated in )