Amr bin Abi Qays عمرو بن أبي قيس الرازي الأزرق كوفي · Chapters on Supplication

“The Messenger of Allah (ﷺ) entered upon me and before me were four thousand date pits, I was making Tasbih with them. He said: ‘You have made Tasbih with these? Should I not teach you that which is more than what you have made Tasbih with?’ So I said: ‘Indeed, teach me.’ So he said: ‘Say: glory is to Allah according to the number of His creation (Subḥān Allāhi `adada khalqihi).’”

“The Mufarridun have preceded.” They said: “And who are the Mufarridun, O Messenger of Allah (ﷺ)?” He said: “Those who absorb themselves in the remembrance of Allah, and remembrance removed their heavy burdens from them, until they will come on the Day of Judgement being light (in weight of their burdens).”