When Isaac felt his end approaching, he called his two sons to him, and charged them with his last wish and will, and gave them his blessing. He said: "I adjure you by the exalted Name, the praised, honored, glorious, immutable, and mighty One, who hath made heaven and earth and all things together, that ye fear Him, and serve Him, and each shall love his brother in mercy and justice, and none wish evil unto the other, now and henceforth unto all eternity, all the days of your life, that ye may enjoy good fortune in all your undertakings, and that ye perish not."