And what proves that Yaqoob
عليه السلام was aware that Yusuf was alive and had disappeared as a divine test is that when the other sons returned in the evening weeping and wailing he asked them: «Why are you crying and wailing? And why don’t I see my dear Yusuf among you? They said: O our father! surely we went off racing and left Yusuf by our goods, so the wolf devoured him, and you will not believe us though we are truthful»
(12:17) This is his shirt that we have brought back for you. Yaqoob
عليه السلام told them to throw the shirt to him and they handed it over to Yaqoob
عليه السلام. He rubbed it on his face and immediately became unconscious. After regaining consciousness he told his sons, “O my sons, do you think that the wolf has eaten up my dear Yusuf?” When they replied in the positive he said, “Then tell me why I cannot perceive the smell of Yusuf’s flesh? And why do I find his shirt undamaged? Even if you grant that the shirt is open from below, did the wolf not need to tear it in order to reach to the shoulders and neck of Yusuf? It is only an allegation on the wolf and indeed my son is oppressed. Nay, your souls have made the matter light for you, but patience is good and Allah is He Whose help is sought for against what you describe. That night Yaqoob
عليه السلام kept away from them and he did not speak to them. He began to recite an elegy for Yusuf
عليه السلام and said again and again: O my dear Yusuf whom I preferred over all my sons; he has been taken away from me! O my dear Yusuf! Of all my children I had hope only in him. And he is snatched from me. O my dear Yusuf! I used to make him sleep on my right and left arm. He is taken away from me. O my dear Yusuf! By whom I filled the emptiness of my loneliness. He is taken away from me. O my dear Yusuf! On whom have you left me or where shall I search for you? O my dear Yusuf! If only I had been with you, so that I could have also borne what you had to bear. O my dear Yusuf! If only I had known on which mountain they have abandoned you or in which river they have thrown you. O my dear Yusuf! If only I had been with you and had suffered the same calamities that you had to suffer.”
Among the points proving that Yaqoob
عليه السلام was aware that Yusuf
عليه السلام was alive and in occultation is that he said: «Maybe Allah will bring them all together to me»
(12:83) And he said: «O my sons! Go and inquire respecting Yusuf and his brother, and despair not of Allah’s mercy; surely none despairs of Allah’s mercy except the unbelieving people»
(12:87). Imam Ja’far Sadiq
عليه السلام said: Prophet Yaqoob
عليه السلام asked the Angel of death: Tell me whether you capture the souls together or you capture each of them separately? He replied: Separately. Then Yaqoob
عليه السلام asked: Is the soul of Yusuf there among the souls that you have captured? “No,” said the angel. Thus after this Yaqoob
عليه السلام told his sons, “O my sons, go out and search for Yusuf and his brother.’ Thus the condition of the people of our time who know about the Master of the Time living in concealment and those who have his recognition is the same as the condition of Yaqoob
عليه السلام regarding Prophet Yusuf and his concealment. And those who are ignorant and foolish, they behave in the same way as did the family members and relatives of Yaqoob
عليه السلام. They were so ignorant about Yusuf and his occultation that they used to tell their father: “By Allah, you are most surely in your old error."
And the saying of Yaqoob when the bringer of good news rubbed the shirt of Yusuf on his face and he regained his eyesight that: “Did I not say to you that I know from Allah what you do not know?” This proves that he knew that Yusuf was alive and that he had to go into occultation by way of test.