Narrated Anas bin Malik: `Abdur-Rahman bin `Auf came (from Mecca to Medina) and the Prophet made a bond of brotherhood between him and Sa`d bin Ar-Rabi` Al-Ansari. Al-Ansari had two wives, so he suggested that `Abdur- Rahman take half, his wives and property. `Abdur-Rahman replied,   May Allah bless you with your wives and property. Kindly show me the market.   So `Abdur-Rahman went to the market and gained (in bargains) some dried yoghurt and some butter. After a few days the Prophet saw `Abdur-Rahman with some yellow stains on his clothes and asked him,   What is that, O `Abdur-Rahman?   He replied,   I had married an Ansari woman.   The Prophet asked,   How much Mahr did you give her?   He replied,   The weight of one (date) stone of gold.   The Prophet said,   Offer a banquet, even with one sheep.