The Jews said they killed Him, the Apostles believed it. Why else would they be frightened when Jesus, pbuh, was to come to them later?
It seems quite clear. The apostles were human and outside of Lazarus, had not experienced a ressurection. The apostles were disciples of Christ, meaning they were in training. Much of their learning came after remembering Christ's words and reflecting on past events. I do not find fear to be an abnormal reaction to seeing someone you thought had been crucified alive.
They expected Him to be dead and thought He was a ghost. However, Jesus, pbuh, tells them He is not a spirit. He tells them a spirit does not have flesh like He does. He goes so far as to ask for food. A spirit doesn't have the need for food.So, obviously, He never died.
There are many who eat without needing to eat. For spirits, it may be part of the enjoyment of Heaven, unless the Quran is incorrect.
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YUSUFALI: (Every) fruit (enjoyment) will be there for them; they shall have whatever they call for;
PICKTHAL: Theirs the fruit (of their good deeds) and theirs (all) that they ask;
SHAKIR: They shall have fruits therein, and they shall have whatever they desire.
He was very much alive... Call it whatever you like, mistranslation, misquote or inaccuracy....the facts speak for themselves. If He died, as Christian doctrine suggests, why did He try to convince the disciples otherwise and why did He tell Mary Magdalen He wasn't dead? He was, however, very much alive as the Qur'an tells us and never died, but was taken up.
Actually He was trying to convince them He had risen from the dead. He is still trying to convince Muslims of this today.
Lk 16:19 "There was a certain rich man who was clothed in purple and fine linen and fared sumptuously every day. 20 "But there was a certain beggar named Lazarus, full of sores, who was laid at his gate, 21 "desiring to be fed with the crumbs which fell from the rich man's table. Moreover the dogs came and licked his sores. 22 "So it was that the beggar died, and was carried by the angels to Abraham's bosom. The rich man also died and was buried.
23 "And being in torments in Hades, he lifted up his eyes and saw Abraham afar off, and Lazarus in his bosom. 24 "Then he cried and said, 'Father Abraham, have mercy on me, and send Lazarus that he may dip the tip of his finger in water and cool my tongue; for I am tormented in this flame.'
25 "But Abraham said, 'Son, remember that in your lifetime you received your good things, and likewise Lazarus evil things; but now he is comforted and you are tormented. 26 'And besides all this, between us and you there is a great gulf fixed, so that those who want to pass from here to you cannot, nor can those from there pass to us.' 27 "Then he said, 'I beg you therefore, father, that you would send him to my father's house, 28 'for I have five brothers, that he may testify to them, lest they also come to this place of torment.'
29 "Abraham said to him, 'They have Moses and the prophets; let them hear them.' 30 "And he said, 'No, father Abraham; but if one goes to them from the dead, they will repent.' 31 "But he said to him, 'If they do not hear Moses and the prophets, neither will they be persuaded though one rise from the dead.' "