Supplicating Allah using His Greatest Name

Buraydah (may Allah be pleased with him) said:
The Messenger of Allah (peace be upon him) heard a man saying:

“O Allah, I ask You, I bear witness that there is none worthy of worship but You, the One, the Self-Sufficient Master Whom all creatures need, Who begets not, nor was He begotten, And there is none coequal or comparable to Him”

اللهم إني أسألك بأني أشهد أنك أنت الله لا إله إلا أنت الأحد الصمد الذي لم يلد ولم يولد ولم يكن له كفوًا أحد

Allaahumma innee as aluka  bi annee ash-hadhu annaka antallaah, Laa ilaaha illaa anta, Al Ahad As-Samad, alladhee lam yalid walam yoolad, wa lam yakullahoo kufuwan Ahad

and he (peace be upon him) said: You have supplicated Allah using His Greatest Name, when asked with this name He gives, and when supplicated by this name He answers.

Related by the Four Compilers of Hadith (Imams Abu Dawud, Al-Tirmidhy, Al-Nasa’y and Ibn Majah) and Ibn Hibban graded it as Sahih

Source : Sheikh Ibn Baaz’s Tuhfit Al-Akhyar – alifta.net