Narrated Anas ibn Malik: I was sitting with the Messenger of Allah ﷺ and a man was offering prayer. He then made supplication: O Allah, I ask Thee by virtue of the fact that praise is due to Thee, there is no deity but Thou, Who showest favour and beneficence, the Originator of the Heavens and the earth, O Lord of Majesty and Splendour, O Living One, O Eternal One. The Prophet ﷺ then said: He has supplicated Allah using His Greatest Name, when supplicated by this name, He answers, and when asked by this name He gives.
Hadith Referenceسنن ابي داود / كتاب تفريع أبواب الوتر / 1495
´Anas said that:` The Prophet (ﷺ) entered the Masjid and there was a man who had performed Salat and was supplicating. He was saying in his supplication: “O Allah, none has the right to be worshipped but Allah, You are the One Who gives blessings, Originator of the heavens and the earth, Possessor of glory and generosity (Allāhumma lā ilāha illā ant, al-Mannān, Badī`us-samāwāti wal-arḍ, Dhal-Jalāli wal Ikrām).” So the Prophet (ﷺ) said: “Do you know what he has supplicated Allah with? He has supplicated to Allah by His Greatest Name, the one which if He Is called upon by it, He responds, and when He is asked by it, He gives.”
Shaykh Dr. Abdur Rahman Freywai
Explanation: 1: O Allah! There is no deity worthy of worship except You. You alone are the Benefactor; You alone are the Creator and Originator of the heavens and the earth. O Possessor of Majesty and Generosity, (accept my supplication).
Source: Sunan al-Tirmidhi – Majlis ‘Ilmi Dar al-Da‘wah, New Delhi Edition, Page: 3544