And to Allah belong the best names, so invoke Him by them.. (Quran 7:180) Allah there is no deity except Him. To Him belong the best names. (Quran 20:8) He is Allah, the Creator, the Inventor, the Fashioner; to Him belong the best names. (Quran 59:24) Prophet Muhammad (ﷺ) said Allah has ninety-nine names, i.e. one-hundred minus one, and whoever knows them will go to Paradise. (Sahih Bukhari 50:894)
Sufis believe that by constantly remembering Allah’s names through dhikr (remembrance) and invoking those names with intention, one can attain deeper spiritual knowledge and connection with the Divine. This remembrance of Allah’s names plays an important role in the Sufi path and method of achieving mystical experience of God. Reciting his beautiful names like Ar-Rahman, Al-Malik, Al-Ghaffar etc is a form of worship for Sufis.