AbuHurairah narrated that he heard the Messenger of Allah (ﷺ) say:
"Inblack seed there is healing for every disease, except the Sam." "Sam means death. And black seed is Shuwniz." (FR)
English reference (FR): Vol. 4, Book 31, Hadith 3447 (FR)
Arabic reference (FR): Book 31, Hadith 3573 (FR)