"The Messenger of Allah forbade offering more for something that has already been bought by his brother, or for a man to propose marriage to a woman when someone else has already proposed to her, unless the previous suitor gave up the idea or gave him permission."
Reference: Sunan an-Nasa'i 3243 In-book : Book 26, Hadith 48 English translation : Vol. 4, Book 26, Hadith 3245
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