And the Friday will be like the day, and the day will be like the hour, and the hour will be like the blaze of fire.¹

This is a strange hadith from this chain, and Saʿd ibn Saʿīd is the brother of Yaḥyā ibn Saʿīd al-Anṣārī.

19 — Chapter on the Shortness of Hope

2486 — Maḥmūd ibn Ghaylān narrated to us, Abū Aḥmad narrated to us, Sufyān narrated to us, from Layth, from Mujāhid, from Ibn ʿUmar, who said: The Messenger of Allah, peace and blessings be upon him, took hold of part of my body and said: "Be in this world as if you were a stranger or a wayfarer, and count yourself among the people of the graves." Then he said to me: "O Ibn ʿUmar, when you enter the morning, do not speak to yourself of the evening, and when you enter the evening, do not speak to yourself of the morning. Take from your health before your sickness, and from your life before your death, for you do not know, O ʿAbd Allah, what your name will be tomorrow."²

2487 — Aḥmad ibn ʿAbda al-Ḍabbī al-Baṣrī narrated to us, Ḥammād ibn Zayd narrated to us,

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¹ Authentic due to corroborating evidence, though this chain is weak due to the weakness of ʿAbd Allah ibn ʿUmar al-ʿUmarī. However, it has a supporting witness from the hadith of Abū Hurayrah in al-Musnad (10943), and its chain is authentic.

² This is an authentic hadith except for his saying: "and count yourself among the people of the graves," which is good due to corroborating evidence. It was recorded by al-Bukhārī (6416) and Ibn Mājah (4114). It is in al-Musnad (4764) and Ṣaḥīḥ Ibn Ḥibbān (698), and the saying "and count yourself among the people of the graves" is not in the narration of al-Bukhārī and Ibn Ḥibbān, and we have mentioned its supporting witnesses in al-Musnad.