اَللَّهُمَّ إِنِّي أَسْأَلُكَ بِأَنَّ لَكَ الْحَمْدَ لَا إِلَهَ إِلَّا أَنْتَ الْمَنَّانُ بَدِيعُ السَّمَاوَاتِ وَالْأَرْضِ، يَا ذَا الْجَلَالِ وَالْإِكْرَامِ، يَا حَيُّ يَا قَيُّومُ، إِنِّي أَسْأَلُكَ

Allaahumma inni as'aluka bi-anna lakal-hamda, laa ilaaha illaa antal-mannaanu badi'us-samaawaati wal-ardi, yaa dhal-jalaali wal-ikraam! Yaa ‘hayyu yaa qayyum inni as aluk

O Allah, indeed I ask You since all praise is due to You, there is none worthy of worship but You, the Bestower, the Creator of the heavens and earth, O Possessor of majesty and honor, O Ever-living, O-Eternal. I am asking to you. I was sitting with the Messenger of Allah (ﷺ) and a man was praying. When he bowed, prostrated and recited the tashahhud, he supplicated, and in his supplication he said: (the above mentioned dua). The Prophet (ﷺ) said, 'Do you know what he has supplicated with?' They said, "Allah (SWT) and His Messenger know best." He said, 'By the One in Whose Hand is my soul, he called upon Allah by His greatest Name, which, if He is called by it, He responds, and if He is asked by it, He gives.'

Reference: Sahih (Albani). Nasai: 1300