Tirmidhi

Hadith Commentary:

In reality, death arrives at its appointed time; no matter what measures a person takes, no matter how many medicines he uses, no matter how wealthy or resourceful he may be, there is nothing among these that can avert death. Indeed, it is true:

﴿كُلُّ نَفْسٍ ذَائِقَةُ الْمَوْتِ﴾
[Every soul shall taste death.]

Hadith Commentary:
The time of death is fixed; it will certainly come, no matter how much medicine is used. There is no cure for it in this world. Black seed (kalonji) is, in its general sense, a remedy for every illness, although some scholars believe that from this generality, a specific meaning is intended. They say that it is not possible for all properties to be combined in a single herb such that it becomes a cure for all diseases. However, our experience is that it is as general as stated, and there is healing in it for every illness. We use it for every disease, and so far, we have not experienced any failure with it. If honey is mixed with it, it is like gold upon gold (i.e., even more beneficial). A few years ago, Darussalam prepared a compound by mixing black seed (kalonji) with honey, which was very beneficial and successful. If a few seeds are taken with water at bedtime, then, in sha Allah, there will be healing from every illness. It can be used both as a single ingredient and in combination. Hafiz Ibn Hajar rahimahullah writes that perhaps Hazrat Ghalib bin Abjar radi Allahu anhu was suffering from a cold, which is why Ibn Abi Atiq suggested administering the medicine by dropping it into the nose. (Fath al-Bari: 10/179)

Hadith Commentary:
Vocabulary of the Hadith:
Al-habbah al-sawda’:
That which is called "shoneez" in Persian,
"kalonji" in Urdu, and "black cumin" in English,
which are a type of black seeds,
which are white from the inside, and some have called it "kali jeeri." According to Dr. Khalid Ghaznavi,
the kalonji plant is like a shrub, approximately half a meter tall,
which bears blue flowers.

Benefits and Issues:
The Messenger of Allah (sallallahu alayhi wa sallam) has declared kalonji to be a remedy for every disease, and this is a statement based on reality.
As research progresses,
its benefits continue to be discovered, and it is not known in the future
in which diseases its efficacy will manifest.
For a detailed account of its benefits, see
(Tibb Nabawi sallallahu alayhi wa sallam aur Jadeed Science,
pp. 246 to 254)
and for the benefits of ‘ud hindī, see this book, pp. 225 to 237.

Benefit:
It is established from this hadith that there is healing in black seed (kalonji), and there is no doubt whatsoever in its healing properties. It should be given to the sick. Similarly, Zamzam water and honey are also sources of healing, and their use should also be common in households.