Fiqh-us-Sunnah Volume 4, Funerals and Dhikr, Fiqh 4.114A.

Buraidah reported that the Prophet, peace be upon him, heard a man saying, “O Allah, I ask You, I bear witness that there is no god but You, the One, the Etemal, Besought of all, Who begets not, nor is begotten; and there is none like unto Him.” The Prophet, peace be upon him, said, “You have asked Allah by His Greatest Name. When one asks Him by this name, He gives, what one desires, and when supplicated by this name He answers.” (Reported by Abu Daw’ud and Tirmizhi, who regards it a sound hadith)

Commenting on the above hadith, Al-Munzhri says, “Our teacher Abu al-Hasan Al-Maqdisi said, ‘There is no weakness in its chain, and no other and more sound hadith is found on this subject’.”

Mu’azh b. Jabal reported that the Prophet, peace be upon him, heard a man saying, “O Lord of Majesty and Honour!” At this the Prophet, peace be upon him, said, “Your supplication will be heard, so ask for what you want to ask.” (Reported by Tirmizhi, who says it is a sound hadith)

Anas reported, “Once the Prophet, peace be upon him, passed by Abu ‘Ayyash, Zayd b. as-Samit az-Zarqi, while he was offering prayer and saying, ‘O Allah, I call upon You for to You is due all praise, there is no god but You, O the Compassionate One, O the True Benefactor, the Originator of the heavens and the earth, the Lord of Majesty and Honour, O the Living One, O the One Who is self-subsisting and sustains all.’ The Prophet, peace be upon him, said, ‘You have called upon Allah by His greatest name. Anyone calling upon Him by this name is heard, and whatever one asks Him for, He grants it’.” (Reported by Ahmad and others. Al-Hakim says that it is sound according to the criterion of Muslim) Mu’awiyah reported, “I heard the Prophet, peace be upon him, saying, ‘Whoever supplicates with these five phrases will be granted whatever he asks, ‘la ilaha illa-Allah wallahu akhar (there is no god but Allah and Allah is the greatest), la ilaha ill-Allahu wahdahu la sharika lahu (there is no god but only Allah, and he has no partners), lahul-mulku wa lahul-hamd wa huwa ‘ala kulli shai’in qadir (to Him belongs the authority and His is all praise, and He has power over all things), la ilaha illa-Allahu wa la hawla wala quwwata illa billah (there is no god but Allah and there is no power nor any strength except with His permission).” (Reported by At-Tabarani with a sound chain)