As a Prophet, he has special merits that Allah had given him. These are exceptions only for Prophets of Allah. There is another verse in the Quran that states this 33:50

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He is not a mahram for her till the marriage is consummated. Allah says: Forbidden to you are your mothers,your daughters, …… and the stepdaughters – who are your foster-children, born of your wives with whom you have consummated the marriage; but if you have not consummated the marriage with them, there will be no […]

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