A person prays after Tashahhud -
اَللَّهُمَّ إِنِّي أَسْأَلُكَ بِأَنَّ لَكَ الْحَمْدَ لَا إِلَهَ إِلَّا أَنْتَ الْمَنَّانُ، بَدِيعُ السَّمَوَاتِ وَالْأَرْضِ يَا ذَا الْجَلَالِ وَالْإِكْرَامِ، يَا حَيُّ يَا قَيُّوْمُ
اَللّٰهُمَّ اِنِّىْ اَسْاَلُكَ بِاَنَّ لَكَ الْحَمْدَ لَا اِلٰهَ اِلَّا اَنْتَ الْمَنَّانُ، بَدِيْعُ السَّمَاوَاتِ وَالْاَرْضِ يَاذَا الْجَلَالِ وَالْاِكْرَامِ، يَاحَيُّ يَاقَيُّوْمُ
Allaahumma inni as'aluka bi-anna lakal-hamda, laa ilaaha illaa antal-mannaanu badi'us-samawaati wal-ardi, yaa dhal-jalaali wal-ikraam! Yaa hayyu yaa qayyum
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.
Then 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.