Compiled by Imam Yahya ibn Sharaf al-Nawawi
وعن جابر رضى الله عنه أن النبي صلى الله عليه وسلم سأل أهله الأدم فقالوا: ما عندنا إلا خل، فدعا به، فجعل يأكل ويقول: "نعم الأدم الخل، نعم الأدم الخل" .((رواه مسلم))
The Prophet (ﷺ) asked for sauce and was told that there was nothing except vinegar. He asked for it and began to eat from it saying, "How excellent is vinegar when eaten as sauce! How excellent is vinegar when eaten as Udm!"[Muslim].