It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) that the Noble Prophet (peace and blessings be upon him) said: "No person should sell over the sale of his brother, nor should he send a marriage proposal over the proposal of his brother, unless he is granted permission."
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 6411