Sunan an-Nasa'i, Book 26, Hadith 179 (In-Book) ⓘ
It was narrated that Anas said: "The Messenger of Allah saw a trace of yellow perfume on me" -as if he meant 'Abdur-Rahman bin 'Awf- "and said: 'What's this for?' He said: 'I have married a woman from among the Ansar.' He said: 'Give a Walimah (wedding feast) even if it is with one sheep.'"
أَخْبَرَنِي أَحْمَدُ بْنُ يَحْيَى بْنِ الْوَزِيرِ بْنِ سُلَيْمَانَ، قَالَ حَدَّثَنَا سَعِيدُ بْنُ كَثِيرِ بْنِ عُفَيْرٍ، قَالَ أَنْبَأَنَا سُلَيْمَانُ بْنُ بِلاَلٍ، عَنْ يَحْيَى بْنِ سَعِيدٍ، عَنْ حُمَيْدٍ الطَّوِيلِ، عَنْ أَنَسٍ، قَالَ رَأَى رَسُولُ اللَّهِ صلى الله عليه وسلم عَلَىَّ - كَأَنَّهُ يَعْنِي عَبْدَ الرَّحْمَنِ بْنَ عَوْفٍ - أَثَرَ صُفْرَةٍ فَقَالَ " مَهْيَمْ " . قَالَ تَزَوَّجْتُ امْرَأَةً مِنَ الأَنْصَارِ . فَقَالَ " أَوْلِمْ وَلَوْ بِشَاةٍ " .
also referenced under: Hadith 3374 (Reference) & Volume 4, Book 26, Hadith 3376 (DarusSalam)