The Messenger of Allah ﷺ said, "Make use of this black seed, for in it is a cure for every disease except death."
أن رسول الله ﷺ قال: عليكم بهذه الحبة الله ﷺ السوداء؛ فإن فيها شفاء من كل داء إلا السام.
Ibn Majah (3448) narrated it from Abu Salama, Yahya bin Khalaf, who said, Abu Asim told us, from Uthman bin Abdul-Malik, who said, I heard Salim bin Abdullah narrating from his father, and he mentioned it. Its chain of transmission is hasan because of Uthman bin Abdul-Malik, who is the Makkan muezzin, about whom there is disagreement, but he is fine in a hadith that has an established basis, and Ibn Main said, there is no harm in him.