عَنْ أَبِي هُرَيْرَةَ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «مَا أَنْزَلَ اللَّهُ دَاء إِلا أنزل لَهُ دَوَاء» . رَوَاهُ البُخَارِيّ

Aba Huraira told of hearing God’s messenger say

“Nigella seed is a remedy for every disease but sam.” Ibn Shihab said sant is death and the nigella seed is shuniz.* (Bukhari and Muslim.)* Taj al-’arus says this is a Persian word which came to be used by Arabs. It indicates a seed of a species of nigella.