As for reading the word in the nominative, that is by assuming it to be the predicate of an omitted subject; reading it in the accusative is on the implicit phrase, “I mean: death”; and reading it in the genitive treats it as an explanatory apposition—the last of these is probably the strongest.
Lessons drawn from the ḥadīth
1 – Its purport is that death removes the pleasures of worldly life, cutting them off from a person.
2 – Remembering death is the greatest preacher to the human soul and the strongest reminder against long-ranging hopes, being deceived by life, and resting one’s heart on it.
3 – A person should not neglect the remembrance of death, for it is the most powerful admonition; recalling it spurs one on to obedience and to preparing for what follows.
4 – Among the narrations is the saying, “You do not mention it in abundance without it diminishing much, nor in scarcity without it making little seem much.” Thus, frequent remembrance of death shortens worldly hopes and makes one await the appointed term.
5 – A human being in this life is either in hardship or ease, blessing or trial; he needs to remember death in both states. If he recalls it while in blessing, he will not become heedless; and if he recalls it while afflicted, he will not despair. Ibn Masʿūd (may Allah be pleased with him) was asked, “Who are the wisest of people?” He replied, “Those who remember death the most and are best prepared for what comes after it—those are the truly wise.”
6 – ʿUmar ibn ʿAbd al-ʿAzīz (may Allah have mercy on him) said: “The world is quick to perish, near to its end; it promises permanence but fails to keep its pledge. You look at it and see it still and settled, yet it is moving with violent speed and departing with rapid travel. The onlooker may not feel its movement and therefore feels secure in it; he only senses it when it is gone.”
7 – Shaykh al-Islām said: “It is not recommended for a Muslim to mark out his grave before he dies, for the Prophet ﷺ did not do that, nor did his Companions. A servant does not know when he will die, nor where. If a person’s aim is to prepare for death, that is achieved through righteous deeds; therefore he is encouraged to remember it often, get ready for it, and repent before it arrives.”