Thereafter the king invited Isaac to settle in his domains, and he assigned fields and vineyards to him for cultivation, the best the land afforded.[59] But Isaac was not self-interested. The tithe of all he possessed he gave to the poor of Gerar. Thus he was the first to introduce the law of tithing for the poor, as his father Abraham had been the first to separate the priests' portion from his fortune.[60] Isaac was rewarded by abundant harvests; the land yielded a hundred times more than was expected, though the soil was barren and the year unfruitful. He grew so rich that people wished to have "the dung from Isaac's she-mules rather than Abimelech's gold and silver."[61] But his wealth called forth the envy of the Philistines, for it is characteristic of the wicked that they begrudge their fellow-men the good, and rejoice when they see evil descend upon them, and envy brings hatred in its wake, and so the Philistines first envied Isaac, and then hated him. In their enmity toward him, they stopped the wells which Abraham had had his servants dig. Thus they broke their covenant with Abraham and were faithless, and they have only themselves to blame if they were exterminated later on by the Israelites. Isaac departed from Gerar, and began to dig again the wells of water which they had digged in the days of Abraham his father, and which the Philistines had stopped. His reverence for his father was so great that he even restored the names by which Abraham had called the wells. To reward him for his filial respect, the Lord left the name of Isaac unchanged, while his father and his son had to submit to new names.[62] After four attempts to secure water, Isaac was successful; he found the well of water that followed the Patriarchs. Abraham had obtained it after three diggings. Hence the name of the well, Beer-sheba, "the well of seven diggings," the same well that will supply water to Jerusalem and its environs in the Messianic time.[63] Isaac's success with his wells but served to increase the envy of the Philistines, for he had come upon water in a most unlikely spot and, besides, in a year of drouth. But "the Lord fulfils the desire of them that fear Him." As Isaac executed the will of his Creator, so God accomplished his desire.[64] And Abimelech, the king of Gerar, speedily came to see that God was on the side of Isaac, for, to chastise him for having instigated Isaac's removal from Gerar, his house was ravaged by robbers in the night, and he himself was stricken with leprosy.[65] The wells of the Philistines ran dry as soon as Isaac left Gerar, and also the trees failed to yield their fruit. None could be in doubt but that these things were the castigation for their unkindness.