الحبة السوداء
Small black seeds (also called kalonji or black cumin) described as containing benefit for every ailment except death itself. Used ground, in oil, or mixed with honey.
إِنَّ فِي الْحَبَّةِ السَّوْدَاءِ شِفَاءً مِنْ كُلِّ دَاءٍ إِلَّا السَّامَ، وَالسَّامُ الْمَوْتُ
“In the black seed there is healing for every illness except death itself.” (meaning, not a literal translation)
A companion recovering from illness was advised to crush five or seven seeds and apply the oil into each nostril, citing this same hadith from 'A'ishah (Sahih al-Bukhari 5687). This is one of the most widely cited hadith in the entire Prophetic-medicine tradition, and also one of the most frequently misquoted in popular circulation — the wording is often paraphrased far more absolutely than the hadith itself states, which is why the precise translation and its scholarly reading matter here.
Ibn al-Qayyim reads the phrase as similar to Qur'anic hyperbole ('destroying everything' meaning everything destructible) — i.e. a cure for every illness that is, by its nature, treatable. He lists over ten preparations depending on the ailment: with honey and warm water for stone-related complaints, applied to the navel for intestinal worms, or its smoke used to repel insects. He's careful to frame black seed as one tool among several in the broader Prophetic-medicine tradition, not a singular cure-all to be substituted for other treatment or for seeking medical help — a point he makes explicitly elsewhere in Zad al-Ma'ad, given how absolute the hadith's wording can sound out of context.
Nigella sativa has been one of the more heavily studied botanicals in modern research, with laboratory and small clinical studies examining its main active compound (thymoquinone) for anti-inflammatory and antioxidant activity. This is a genuinely active area of ongoing research rather than settled clinical consensus, and is noted here as separate modern context — not as validation or interpretation of the hadith's specific wording.