It was narrated from Anas bin Malik:
the Prophet saw traces of yellow perfume on 'Abdur-Rahmaan bin 'Awf, and he asked him "What is this?" He said: "O Messenger of Allah, I married a women for the weight of a Nawah (Stone) of gold. He said: "May Allah bless you. Give a feast even if it is only with one sheep."
English reference: Vol. 3, Book 9, Hadith 1907
Arabic reference: Book 9, Hadith 1982