The Messenger of Allah ﷺ said, "You must use this black seed, for in it is a cure for every disease except as-sam."Someone asked, "Messenger of Allah, what is as-sam?"He replied, "Death."
حدثنا يحيى وهو ابن سعيد قال حدثنا محمد بن عمرو قال حدثنا أبو سلمة
قال رسول الله ﷺ عليكم بهذه الحبة السوداء فإن فيها شفاء من كل داء إلا السام قيل يا رسول الله وما السام قال الموت
Its isnad is sahih, it passed at 9440.9508m - Yazid bin Harun and Naal narrated to us, they said, Muhammad bin Amr narrated to us, and similarly regarding black beard hair. Sahih.(9508m) Its isnad is sahih, and it is like the one before it.