The Messenger of Allah ﷺ said, "What an excellent condiment vinegar is."
حدثنا وكيع عن المثنى بن سعيد عن أبي سفيان طلحة بن نافع
قال رسول الله ﷺ نعم الأدم الخل
No references are available.
Its isnad is sahih. Muthanna bin Saeed is Dubai, mentioned previously, and he is trustworthy. The hadith was narrated by Muslim, 3/1622, no. 2052, in the Book of Drinks, chapter on the merit of vinegar, and by Tirmidhi, 4/245, no. 1839, in the Book of Foods, chapter on what has been said about vinegar.