Sahih Muslim Book 008, Hadith Number 3321.

Chapter: The dower.

Anas b. Malik (Allah be pleased with him) reported that 'Abd al-Rahman b. 'Auf (Allah be pleased with him) married a woman for a date-stone's weight of gold and Allah's Apostle (May peace be upon him) said to him: Hold a wedding feast, even if only with a sheep.