Uqba b. 'Amir said on the pulpit that Allah's Messenger (ﷺ) said:
A believer is the brother of a believer, so it is not lawful for a believer to outbid his brother, and he should not propose an engagement when his brother has thus proposed until he gives it up.
Reference: Sahih Muslim 1414 In-book : Book 16, Hadith 66 USC-MSA web (English) : Book 8, Hadith 3294 (deprecated)
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