The Messenger of Allah said: "Whichever woman married without the permission of her Wali her marriage is invalid, her marriage is invalid, her marriage is invalid. If he entered into her, then the Mahr is for her in lieu of what he enjoyed from her private part. If they disagree, then the Sultan is the Wali for one who has no Wali."
Reference: Jami` at-Tirmidhi 1102 In-book : Book 11, Hadith 23 English translation : Vol. 2, Book 6, Hadith 1102
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