It was Isaac, or, as he is sometimes called, Elihu the son of Barachel, who revealed the wonderful mysteries of nature in his arguments with Job.[70] At the end of the years of famine, God appeared unto Isaac, and bade him return to Canaan. Isaac did as he was commanded, and he settled in Hebron. At this time he sent his younger son Jacob to the Bet ha-Midrash of Shem and Eber, to study the law of the Lord. Jacob remained there thirty-two years. As for Esau, he refused to learn, and he remained in the house of his father. The chase was his only occupation, and as he pursued beasts, so he pursued men, seeking to capture them with cunning and deceit. On one of his hunting expeditions, Esau came to Mount Seir, where he became acquainted with Judith, of the family of Ham, and he took her unto himself as his wife, and brought her to his father at Hebron. Ten years later, when Shem his teacher died, Jacob returned home, at the age of fifty. Another six years passed, and Rebekah received the joyful news that her sister-in-law 'Adinah, the wife of Laban, who, like all the women of his house, had been childless until then, had given birth to twin daughters, Leah and Rachel.[71] Rebekah, weary of her life on account of the woman chosen by her older son, exhorted Jacob not to marry one of the daughters of Canaan, but a maiden of the family of Abraham. He assured his mother that the words of Abraham, bidding him to marry no woman of the Canaanites, were graven upon his memory, and for this reason he was still unmarried, though he had attained the age of sixty-two, and Esau had been urging him for twenty-two years past to follow his example and wed a daughter of the people of the land in which they lived. He had heard that his uncle Laban had daughters, and he was resolved to choose one of them as his wife. Deeply moved by the words of her son, Rebekah thanked him and gave praise unto God with the words: "Blessed be the Lord God, and may His Holy Name be blessed for ever and ever, who hath given me Jacob as a pure son and a holy seed; for he is Thine, and Thine shall his seed be continually and throughout all the generations for evermore. Bless him, O Lord, and place in my mouth the blessing of righteousness, that I may bless him." And when the spirit of the Lord came over her, she laid her hands upon the head of Jacob and gave him her maternal blessing. It ended with the words, "May the Lord of the world love thee, as the heart of thy affectionate mother rejoices in thee, and may He bless thee."[72] ISAAC BLESSES JACOB