What was the kindly gesture made by Prophet Muhammad (saw) when `Abdur-Rahman bin `Auf came to them?
 Narrated Anas:                     When `Abdur-Rahman bin `Auf came to us, Allah's Apostle made a bond of fraternity between him and Sa`d bin Ar-Rabi` who was a rich man, Sa`d said, "The Ansar know that I am the richest of all of them, so I will divide my property into two parts between me and you, and I have two wives; see which of the two you like so that I may divorce her and you can marry her after she becomes lawful to you by her passing the prescribed period (i.e. 'Idda) of divorce. `Abdur Rahman said, "May Allah bless you your family (i.e. wives) for you." (But `Abdur-Rahman went to the market) and did not return on that day except with some gain of dried yogurt and butter. He went on trading just a few days till he came to Allah's Apostle bearing the traces of yellow scent over his clothes. Allah's Apostle asked him, "What is this scent?" He replied, "I have married a woman from the Ansar." Allah's Apostle asked, "How much Mahr have you given?" He said, "A date-stone weight of gold or a golden date-stone." The Prophet said, "Arrange a marriage banquet even with a sheep."