Burayda bin Husayb reported,

The Messenger of Allah ﷺ heard a man saying, "Allah, I ask You, bearing witness that You are Allah, there is no god but You, the One, the Eternal Refuge, who has not begotten and was not begotten, and to whom none is equal."The Messenger of Allah ﷺ said, "You have asked Allah by the name which, when He is asked by it, He gives, and when He is called upon by it, He answers."

Azami 10899

Sahih

عن بريدة بن الحصيب الأسلمي

أن رسول الله ﷺ سمع رجلا يقول: اللهم إني أسألك أني أشهد أنك أنت الله لا إله إلا أنت الأحد الصمد الذي لم يلد، ولم يولد ولم يكن له كفوا أحد. فقال رسول الله ﷺ: لقد سألت الله بالاسم الذي إذا سئل به أعطى، وإذا دعي به أجاب.

الأعظمي 10899صحيح
Contents
Reference
Commentary
Ayat
Collection
Jami al-Kamil
Book
Supplications, remembrances, and prayer upon the chosen Prophet ﷺ
Chapter
Etiquette of supplication
Section
Supplicating to Allah the Exalted by His beautiful names
Numbering
Jami al-Kamil 10899 (2nd edition)
Azami 10899