Muhammad bin Ibrahim bin al-Harith محمد بن إبراهيم بن الحارث · The Book of Zakah

"The Messenger of Allah mentioned the Fire, and he turned his face away (as if seeing it), and sought refuge with Allah from it." (One of the narrators) Shu'bah said: "He did that three times, then he said: 'Protect yourselves from the Fire even with half a date, and if you cannot find that, then with a good word."'