Sufy an bin Abdullah Thaqafi said: "I said: O Messenger of Allah, tell me of something that I can adhere to: He said: Say: "Allah is my Lord," then stand straight (adhere steadfastly to Islam). He said: O Messenger of Allah, what is the thing that you fear most for me? The Messenger of Allah ﷺ took hold of his own tongue, then he said: This:" (Sahih)