While he was preparing these sacrifices, a vision of great import was granted to Abraham. The sun sank, and a deep sleep fell upon him, and he beheld a smoking furnace, Gehenna, the furnace that God prepares for the sinner; and he beheld a flaming torch, the revelation on Sinai, where all the people saw flaming torches; and he beheld the sacrifices to be brought by Israel; and an horror of great darkness fell upon him, the dominion of the four kingdoms. And God spake to him: "Abraham, as long as thy children fulfil the two duties of studying the Torah and performing the service in the Temple, the two visitations, Gehenna and alien rule, will be spared them. But if they neglect the two duties, they will have to suffer the two chastisements; only thou mayest choose whether they shall be punished by means of Gehenna or by means of the dominion of the stranger." All the day long Abraham wavered, until God called unto him: "How long wilt thou halt between two opinions? Decide for one of the two, and let it be for the dominion of the stranger!" Then God made known to him the four hundred years' bondage of Israel in Egypt, reckoning from the birth of Isaac, for unto Abraham himself was the promise given that he should go to his fathers in peace, and feel naught of the arrogance of the stranger oppressor. At the same time, it was made known to Abraham that his father Terah would have a share in the world to come, for he had done penance for his sinful deeds. Furthermore it was revealed to him that his son Ishmael would turn into the path of righteousness while yet his father was alive, and his grandson Esau would not begin his impious way of life until he himself had passed away. And as he received the promise of their deliverance together with the announcement of the slavery of his seed, in a land not theirs, so it was made known to him that God would judge the four kingdoms and destroy them.[114] THE BIRTH OF ISHMAEL The covenant of the pieces, whereby the fortunes of his descendants were revealed to Abraham, was made at a time when he was still childless.[115] As long as Abraham and Sarah dwelt outside of the Holy Land, they looked upon their childlessness as a punishment for not abiding within it. But when a ten years' sojourn in Palestine found her barren as before, Sarah perceived that the fault lay with her.[116] Without a trace of jealousy she was ready to give her slave Hagar to Abraham as wife,[117] first making her a freed woman.[118] For Hagar was Sarah's property, not her husband's. She had received her from Pharaoh, the father of Hagar. Taught and bred by Sarah, she walked in the same path of righteousness as her mistress,[119] and thus was a suitable companion for Abraham, and, instructed by the holy spirit, he acceded to Sarah's proposal.