It is narrated from Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: "None of you should propose over the marriage proposal of his brother, nor sell over the sale of another." And some hadith scholars have added (the words): "until he gives permission or withdraws."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب النكاح / 14031