Hisham bin Saalim from Abi Abdullah (a.s.) that he said:
“A Bedouin came to Prophet Yusuf (a.s.) to purchase rations from him and the latter sold it. When the transaction was over Prophet Yus uf (a.s.) asked, “Where do you live?” He said, “At such and such place.” The narrator says: Yusuf said: So you halt at such and such desert and call out: O Yaqoob! O Yaqoob! And a tall and handsome man will come to you. You tell him that you met a person in Egypt who has conveyed salutations to him. He would say: This trust of yours will not be wasted with Allah, the Mighty and Sublime.
The narrator says: Thus that Bedouin reached to the place. He told his servants to take care of his camel. Then he began to call out: O Yaqoob! O Yaqoob! A tall and handsome man emerged walking with the support of a wall. The Bedouin asked if he was Yaqoob. When he replied in the positive he conveyed to him all that Prophet Yusuf (a.s.) had said. Yaqoob (a.s.) fell down in a swoon and when he regained consciousness he said, “O Bedouin, do you have wish from Allah?” The man said, “I am an affluent person and my wife is the daughter of my paternal uncle. But I don’t have a son from her. I request you to pray that I may have a son. The narrator says that Yaqoob (a.s.) performed ablution, prayed two units of prayer and then supplicated to Allah, the Mighty and Sublime. This man’s wife gave birth to twins, four times.