Language:
كتاب مناقب الأنصار
63
Merits of the Helpers in Madinah (Ansaar)
(50)
Chapter: How the Prophet (saws) established the bond of brotherhood between his
(50)
باب كَيْفَ آخَى النَّبِيُّ صلى الله عليه وسلم بَيْنَ أَصْحَابِهِ
Sahih al-Bukhari 3937

Narrated Anas:

When `Abdur-Rahman bin `Auf came to Medina and the Prophet (ﷺ) established the bond of brotherhood between him and Sa`d bin Ar-Rabi-al-Ansari, Saud suggested that `Abdur-Rahman should accept half of his property and family. `Abdur Rahman said, "May Allah bless you in your family and property; guide me to the market." So `Abdur-Rahman (while doing business in the market) made some profit of some condensed dry yoghurt and butter. After a few days the Prophet (ﷺ) saw him wearing clothes stained with yellow perfume. The Prophet (ﷺ) asked, "What is this, O `Abdur-Rahman?" He said, "O Allah's Messenger (ﷺ)! I have married an Ansar' woman." The Prophet (ﷺ) asked, "What have you given her as Mahr?" He (i.e. `Abdur-Rahman) said, "A piece of gold, about the weight of a date stone." Then the Prophet said, Give a banquet, even though of a sheep."

حَدَّثَنَا مُحَمَّدُ بْنُ يُوسُفَ، حَدَّثَنَا سُفْيَانُ، عَنْ حُمَيْدٍ، عَنْ أَنَسٍ ـ رضى الله عنه ـ قَالَ قَدِمَ عَبْدُ الرَّحْمَنِ بْنُ عَوْفٍ، فَآخَى النَّبِيُّ صلى الله عليه وسلم بَيْنَهُ وَبَيْنَ سَعْدِ بْنِ الرَّبِيعِ الأَنْصَارِيِّ، فَعَرَضَ عَلَيْهِ أَنْ يُنَاصِفَهُ أَهْلَهُ وَمَالَهُ، فَقَالَ عَبْدُ الرَّحْمَنِ بَارَكَ اللَّهُ لَكَ فِي أَهْلِكَ وَمَالِكَ، دُلَّنِي عَلَى السُّوقِ‏.‏ فَرَبِحَ شَيْئًا مِنْ أَقِطٍ وَسَمْنٍ، فَرَآهُ النَّبِيُّ صلى الله عليه وسلم بَعْدَ أَيَّامٍ وَعَلَيْهِ وَضَرٌ مِنْ صُفْرَةٍ، فَقَالَ النَّبِيُّ صلى الله عليه وسلم ‏"‏ مَهْيَمْ يَا عَبْدَ الرَّحْمَنِ ‏"‏‏.‏ قَالَ يَا رَسُولَ اللَّهِ، تَزَوَّجْتُ امْرَأَةً مِنَ الأَنْصَارِ‏.‏ قَالَ ‏"‏ فَمَا سُقْتَ فِيهَا ‏"‏‏.‏ فَقَالَ وَزْنَ نَوَاةٍ مِنْ ذَهَبٍ‏.‏ فَقَالَ النَّبِيُّ صلى الله عليه وسلم ‏"‏ أَوْلِمْ وَلَوْ بِشَاةٍ ‏"‏‏.‏
Reference : Sahih al-Bukhari 3937
In-book reference : Book 63, Hadith 163
USC-MSA web (English) reference : Vol. 5, Book 58, Hadith 274
  (deprecated numbering scheme)