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." (ID)
English reference (ID): Vol. 4, Book 31, Hadith 3447 (ID)
Arabic reference (ID): Book 31, Hadith 3573 (ID)