كتاب المساقاة
22  
The Book of Musaqah
(17)
Chapter: Selling a necklace in which there are pearls and gold
(17)
باب بَيْعِ الْقِلاَدَةِ فِيهَا خَرَزٌ وَذَهَبٌ ‏‏
Sahih Muslim 1591 b

Fadila b. 'Ubaid (Allah be pleased with him) reported:

I bought on the day (of the Victory of Khaibar) a necklace for twelve dinars (gold coins). It was made of gold studded with gems. I separated (gold from gems) in it, and found (gold) of more (worth) than twelve dinars. I made a mention of it to Allah's Apostle (ﷺ), whereupon he said: It should not be sold unless it is separated.
حَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، حَدَّثَنَا لَيْثٌ، عَنْ أَبِي شُجَاعٍ، سَعِيدِ بْنِ يَزِيدَ عَنْ خَالِدِ بْنِ، أَبِي عِمْرَانَ عَنْ حَنَشٍ الصَّنْعَانِيِّ، عَنْ فَضَالَةَ بْنِ عُبَيْدٍ، قَالَ اشْتَرَيْتُ يَوْمَ خَيْبَرَ قِلاَدَةً بِاثْنَىْ عَشَرَ دِينَارًا فِيهَا ذَهَبٌ وَخَرَزٌ فَفَصَّلْتُهَا فَوَجَدْتُ فِيهَا أَكْثَرَ مِنِ اثْنَىْ عَشَرَ دِينَارًا فَذَكَرْتُ ذَلِكَ لِلنَّبِيِّ صلى الله عليه وسلم فَقَالَ ‏ "‏ لاَ تُبَاعُ حَتَّى تُفَصَّلَ ‏"‏ ‏.‏
Reference : Sahih Muslim 1591b
In-book reference : Book 22, Hadith 115
USC-MSA web (English) reference : Book 10, Hadith 3864
  (deprecated numbering scheme)