Sahih Bukhari Volume 007, Book 062, Hadith Number 083.
Narrated By Anas bin Malik : 'Abdur-Rahman bin 'Auf came to Allah's Apostle and he had marks of Sufra (yellow perfume). Allah's Apostle asked him (about those marks). 'AbdurRahman bin Auf told him that he had married a woman from the Ansar. The Prophet asked, "How much Mahr did you pay her?" He said, "I paid gold equal to the weight of a date stone." Allah's Apostle said to him, "Give a wedding banquet, even if with one sheep."