Abu Huraira (Allah be pleased with him) reported Allah's Messenger (ﷺ) as having said this:
Do not outbid in a sale in order to ensnare. No man should enter into a transaction in which his brother has already entered, and no dweller of the town should sell on behalf of the villager. And no man should make a proposal of marriage which his brother has already made and no woman should ask for the divorce of another (co-wife) in order to deprive her of what belongs to her.
Reference: Sahih Muslim 1413 b In-book : Book 16, Hadith 62 USC-MSA web (English) : Book 8, Hadith 3290 (deprecated)
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