´It was narrated that Anas bin Malik said:` "The Prophet (saas) heard a man say: 'Allahumma! Inni as'aluka bi-anna lakal-hamd. La ilaha illa Anta, wahdaka la sharika laka. Al-Mannan. Badi'us-samawati wal-ard. Dhul-jalali wal-ikram (O Allah! I ask You by virtue of the fact that all praise is due to You; none has the right to be worshiped but You alone, and You have no partner or associate, the Bestower, the Originator of the heavens and the earth, the Possessor of majesty and honor.' He (saas) said: 'He has asked Allah by His Greatest Name which, if He is asked thereby He gives and if He is called upon thereby He answers.'"
Hadith Referenceسنن ابن ماجه / كتاب الدعاء / 3858
Hadith Gradingالألبانی:حسن صحيح | زبیر علی زئی:إسناده حسن
´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