From Sahih Muslim (Hadith 3491):
Anas b. Malik (Allah be pleasedwith him) reported that 'Abd al-Rahman b. 'Auf (Allah be pleased with him) married during the lifetime of Allah's Messenger (ﷺ) for a nawat weight of gold and the messenger of Allah (ﷺ) said to him:Give a feast even with a sheep
Reference: Muslim 3491