The Book of Transactions (Kitab Al-Buyu`)
Muslim :: Book 10 : Hadith 3618
Ibn 'Umar (Allah be pleased with them) reported Allah's Messenger (may peace be upon him) as saying: A person should not enter 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 lie gives permission.
Source materials are from the University of Southern California MSA site|
Hadith eBooks converted from Imaan Star