What is the ruling on a person supplicating on behalf of his parents and siblings with the supplication: "In the Name of Allah, with Whose Name nothing whatsoever on earth or in the heaven can inflict harm, and He is the All-Hearing, the All-Knowing," and has an authentic hadith been narrated regarding its virtue, and is it permissible to supplicate with it on behalf of others?

The supplication, "In the name of Allah, with whose name nothing on earth or in the heavens can cause harm, and He is the All-Hearing, the All-Knowing," is authentically reported from the Prophet, peace and blessings be upon him. Whoever recites it three times in the morning and three times in the evening will not be afflicted by any sudden calamity.

Similarly, the virtue of reciting "I seek refuge in the perfect words of Allah from the evil of what He has created" three times in the evening has been authentically reported for protection against the sting of venomous creatures.

Reciting "Qul Huwa Allahu Ahad" (Surah Al-Ikhlas) and the two "Mu'awwidhatayn" (Surah Al-Falaq and Surah An-Nas) three times in the morning and three times in the evening is sufficient against all harm.

These remembrances (adhkar) protect the Muslim from harm and injury, by the permission of Allah. However, the occurrence of calamity despite adhering to them is by Allah's decree and wisdom. These remembrances do not suffice on behalf of household members; rather, every Muslim must be diligent in reciting them personally.

As for the story of the houses around Abu Darda's house burning while his house remained safe, it was reported in the context of another supplication with a weak chain of narration.