Sayyiduna Anas bin Malik (may Allah be pleased with him) said: When Abd al-Rahman bin Awf (may Allah be pleased with him) came to Madinah, the Prophet (peace and blessings be upon him) established brotherhood between him and Sa'd bin al-Rabi' (may Allah be pleased with them both). Sa'd (may Allah be pleased with him) offered Abd al-Rahman (may Allah be pleased with him) his family and half of his wealth; Sa'd (may Allah be pleased with him) had two wives. Abd al-Rahman bin Awf (may Allah be pleased with him) said: May Allah bless you in your family and your wealth; show me the way to the market. Then Abd al-Rahman (may Allah be pleased with him) bought cheese (aqit) and ghee in the market and made a profit. After a few days the Prophet (peace and blessings be upon him) saw Abd al-Rahman bin Awf (may Allah be pleased with him) with traces of yellow on him, and the Prophet (peace and blessings be upon him) asked: "Abd al-Rahman, what is this?" He said: I have married a woman of the Ansar. He (peace and blessings be upon him) asked: "What dower (mahr) did you give?" He said: I gave gold equal to the weight of a date-stone. He (peace and blessings be upon him) said: "Give a wedding feast (walimah), even if with one goat."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصداق / 14499