Language:
كتاب النكاح
67  
Wedlock, Marriage (Nikaah)
(50)
Chapter: "And give to the women their Mahr with a good heart..."
(49)
باب قَوْلِ اللَّهِ تَعَالَى ‏{‏وَآتُوا النِّسَاءَ صَدُقَاتِهِنَّ نِحْلَةً‏}‏
Sahih al-Bukhari 5148

Narrated Anas:

`Abdur Rahman bin `Auf married a woman and gave her gold equal to the weight of a date stone (as Mahr). When the Prophet (ﷺ) noticed the signs of cheerfulness of the marriage (on his face) and asked him about it, he said, "I have married a woman and gave (her) gold equal to a date stone in weight (as Mahr).

حَدَّثَنَا سُلَيْمَانُ بْنُ حَرْبٍ، حَدَّثَنَا شُعْبَةُ، عَنْ عَبْدِ الْعَزِيزِ بْنِ صُهَيْبٍ، عَنْ أَنَسٍ، أَنَّ عَبْدَ الرَّحْمَنِ بْنَ عَوْفٍ ، تَزَوَّجَ امْرَأَةً عَلَى وَزْنِ نَوَاةٍ، فَرَأَى النَّبِيُّ صلى الله عليه وسلم بَشَاشَةَ الْعُرْسِ فَسَأَلَهُ فَقَالَ إِنِّي تَزَوَّجْتُ امْرَأَةً عَلَى وَزْنِ نَوَاةٍ‏ .‏ وَعَنْ قَتَادَةَ عَنْ أَنَسٍ أَنَّ عَبْدَ الرَّحْمَنِ بْنَ عَوْفٍ تَزَوَّجَ امْرَأَةً عَلَى وَزْنِ نَوَاةٍ مِنْ ذَهَبٍ‏.‏
Reference : Sahih al-Bukhari 5148
In-book reference : Book 67, Hadith 83
USC-MSA web (English) reference : Vol. 7, Book 62, Hadith 78
  (deprecated numbering scheme)