Do not purchase in opposition to your brother.

Abu Huraira reported Allah's Messenger (ﷺ) as saying:   A Muslim should not purchase (in opposition) to his brother. Sahih Muslim (Book 21, Hadith 13)

Related Hadith:

Narrated by Ibn 'Umar: The Prophet said, "One amongst you should not enter into a transaction when another is bargaining". Sahih Muslim (Book 21, Hadith 11)


 Abu Huraira reported Allah's Messenger (may peace'be upon him) as saying:         Do not go out to meet riders to enter into  transaction with them; none of you must buy in opposition to another,  nor must you bid
against one another; a townsman must not sell for a man  from the desert, and do not tie up udders of carnels and sheep, and he  who buys them after that has been done has two courses open to him:  after he has milked them he may keep them if he is pleased with them, or  he may return them along with a sit of dates if he is displeased with  them. Sahih Muslim(Book 21, Hadith 15)

• Do not make a proposal of marriage When your brother has already made a proposal.

 Narrated by Ibn 'Umar: The Prophet said, "A person should notenter into a transaction when  his brother is already making a transaction and he should not make a  proposal of marriage when his brother has already made a proposal except  when he gives permission."Sahih Muslim ( Book 21, Hadith 12)

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