وعن سفيان بن عبد الله رضي الله عنه
قال: قلت: يا رسول الله حدثني بأمر أعتصم به قال: «قل ربي الله ثم استقم«قلت: يا رسول الله ما أخوف ما تخاف علي؟ فأخذ بلسان نفسه، ثم قال: «هذا»
I asked: “O Messenger of Allah! Tell me, of something to which I may remain steadfast.” He (sallallahu alayhi wa sallam) said, “Say: My Rubb is Allah and then remain steadfast.” Then I said: “O Messenger of Allah! What do you fear most about me?” He took hold of his own tongue and said: “This.”.
Riyad as-Salihin 1517, Book 18, The Book of the Prohibited actions, Hadith 7. 1 min read