Good and sound.

1457 — ʿUthmān ibn ʿAffān (may Allah be pleased with him) reported that the Messenger of Allah ﷺ said: “No servant who says, each morning and each evening, ‘In the name of Allah, with whose name nothing in the earth or in the heaven can cause harm, and He is the All-Hearing, the All-Knowing,’ three times, will be harmed by anything.” Narrated by Abū Dāwūd and al-Tirmidhī, who graded it ḥasan ṣaḥīḥ (good and sound).

[Explanation]

These two hadiths deal with the prescribed morning-and-evening remembrances; Imām al-Nawawī (d. 676 AH) cited them in his Riyāḍ al-Ṣāliḥīn. The first is the narration of ʿAbdullāh ibn Khabīb (may Allah be pleased with him). The Prophet ﷺ instructed him to recite, in the morning and in the evening, “Say: He is Allah, the One,” “Say: I seek refuge with the Lord of the daybreak,” and “Say: I seek refuge with the Lord of mankind,” three times, and he stated that this would protect him from every harm.

The first of these chapters is Sūrat al-Ikhlāṣ — “Say: He is Allah, the One.” Allah the Exalted dedicated this surah to Himself alone; it speaks only about Him, majestic and sublime, and contains no mention of rulings on purification, prayer, commerce, or anything else. Its entire content is devoted to Allah. Whoever recites it completes his own sincerity toward Allah, for it is itself a chapter of pure devotion and it frees its reciter from shirk (associating partners with Him). The Prophet ﷺ explained that it is equivalent to one-third of the Qur’an, yet it does not take the place of the whole; it matches it in reward but does not suffice for it.