Pronunciation: Allahumma inni as'aluka anni ash-hadu an-na-ka an-tal-lah, la ilaha il-la an-tal a-ha-dus-sa-ma-dul-la-zi lam ya-lid wa lam yu-lad, wa lam ya-kul-lahu kufuwan ahad
Meaning: 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
Virtue: 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.
Reference: Sunan Abu Dawud 1493