Abu Dharr (RA) reported that Allah's Messenger (ﷺ) was asked as to which words were the best. He said: Those for which Allah made a choice for His Angels and His servants (and the words are): "Hallowed be Allah and praise is due to Him."
Hadith ReferenceSahih Muslim / The Book Pertaining to the Remembrance of Allah, Supplication, Repentance and Seeking Forgiveness / Hadith: 2731