hadith-kisi-bhi-shaksh-ko-apne-bhai-ke

Bismillahirrahmanirrahim

Hadith: kisi bhi shaksh ko apne bhai ke Paigham–e- nikah par paigham nahi bhejna chahiye 

Umar Radi Allahu Anhu se rivayat hai ki Rasoollallah SallallahuAlaihi Wasallam ne Kisi ke bhaav(boli)  par bhaav (boli) laganey (Jiyada keemat offer karne) se mana farmaya hai aur kisi shaksh ko apney bhai ke Paigham–e- nikah par paigham nahi bhejna chahiye yahan tak ki paigham bhejne wala apna irada badal le ya use  paigham bhejne ki ijazat de de.
Sahih Bukhari, Vol 6, 5142 

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Narrated Ibn 'Umar Radi AllahuAnhu: The Prophet SallallahuAlaihi wasallam decreed that one should not try to cancel a bargain already agreed upon between some other persons (by offering a bigger price). And a man should not ask for the hand of a girl who is already engaged to his Muslim brother, unless the first suitor gives her up, or allows him to ask for her hand.
Sahih Bukhari, Vol 7, Book 62, No. 73