Sayyiduna Anas (may Allah be pleased with him) said: The Messenger of Allah (peace and blessings be upon him) saw traces of yellow on Sayyiduna Abd al-Rahman bin Awf (may Allah be pleased with him) and asked: "What is this?" Sayyiduna Abd al-Rahman (may Allah be pleased with him) said: I have married a woman. He (peace and blessings be upon him) said: "For how much dower?" Sayyiduna Abd al-Rahman (may Allah be pleased with him) said: For gold equal to a date stone. He (peace and blessings be upon him) said: 'Barak Allahu lak' (May Allah bless you); "hold a wedding feast (walimah), even if only with one sheep."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصداق / 14360