كتاب الأشربة
36  
The Book of Drinks
(30)
Chapter: The virtue of vinegar and using it as a condiment
(30)
باب فَضِيلَةِ الْخَلِّ وَالتَّأَدُّمِ بِهِ ‏‏
Sahih Muslim 2051 b

This hadith has been reported on the authority of Sulaiman b. Bilal with the same chain of transmitters and he is reported to have said:

" The best condiment." And he did not doubt (about this word).
وَحَدَّثَنَاهُ مُوسَى بْنُ قُرَيْشِ بْنِ نَافِعٍ التَّمِيمِيُّ، حَدَّثَنَا يَحْيَى بْنُ صَالِحٍ الْوُحَاظِيُّ، حَدَّثَنَا سُلَيْمَانُ بْنُ بِلاَلٍ، بِهَذَا الإِسْنَادِ وَقَالَ ‏ "‏ نِعْمَ الأُدُمُ ‏"‏ ‏.‏ وَلَمْ يَشُكَّ ‏.‏
Reference : Sahih Muslim 2051b
In-book reference : Book 36, Hadith 225
USC-MSA web (English) reference : Book 23, Hadith 5092
  (deprecated numbering scheme)