Buraidah ibn husaib (RA) said: The Prophet (ﷺ) heard a man supplicating, and he was saying:
اَللَّهُمَّ إِنِّي أَسْأَلُكَ بِأَنِّي اَشْهَدُ أَنَّكَ أَنْتَ اللَّهُ لَا إِلَهَ إِلَّا أَنْتَ الْأَحَدُ الصَّمَدُ الَّذِيْ لَمْ يَلِدْ وَلَمْ يُوْلَدْ وَلَمْ يَكُنْ لَّهُ كُفُوًا أَحَدٌ
Pronunciation
Allaahumma 'innee 'as'aluka bi'annee 'ash-hadu 'annaka 'AntAllahu laa 'ilaaha 'illaa 'Antal-'Ahadus-Samadul-ladhee lam yalid wa lam yoolad wa lam yakun lahu kufuwan 'Ahad
Meaning
O Allah, I ask You, by the fact that I bear witness that You are Allah. There is none worthy of worship but You, the Only ilah, Independent of creation, Who was not begotten and begets not, and none is equal to Him. Then the Prophet (ﷺ) said, ‘By the One in Whose Hand is my soul, he has asked 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.
Source: Sahih (Albani). Abu Dawud: 1493
Read the hadith
حَدَّثَنَا مُسَدَّدٌ، حَدَّثَنَا يَحْيَى، عَنْ مَالِكِ بْنِ مِغْوَلٍ، حَدَّثَنَا عَبْدُ اللَّهِ بْنُ بُرَيْدَةَ، عَنْ أَبِيهِ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم سَمِعَ رَجُلاً يَقُولُ اللَّهُمَّ إِنِّي أَسْأَلُكَ أَنِّي أَشْهَدُ أَنَّكَ أَنْتَ اللَّهُ لاَ إِلَهَ إِلاَّ أَنْتَ الأَحَدُ الصَّمَدُ الَّذِي لَمْ يَلِدْ وَلَمْ يُولَدْ وَلَمْ يَكُنْ لَهُ كُفُوًا أَحَدٌ . فَقَالَ " لَقَدْ سَأَلْتَ اللَّهَ بِالاِسْمِ الَّذِي إِذَا سُئِلَ بِهِ أَعْطَى وَإِذَا دُعِيَ بِهِ أَجَابَ " .
Narrated Buraydah ibn al-Hasib: The Messenger of Allah (ﷺ) heard a man saying: O Allah, I ask Thee, I bear witness that there is no god but Thou, the One, He to Whom men repair, Who has not begotten, and has not been begotten, and to Whom no one is equal, and he said: You have supplicated Allah using His Greatest Name, when asked with this name He gives, and when supplicated by this name he answers. [Sahih (Albani). Abu Dawud: 1493]
Duas from IslamicAPI's Masnun Dua dataset (based on the Quran, hadith, Hisnul Muslim and Rahe Belayat). See the dataset