(20) باب الْحَثِّ عَلَى الصَّدَقَةِ وَلَوْ بِشِقِّ تَمْرَةٍ أَوْ كَلِمَةٍ طَيِّبَةٍ وَأَنَّهَا حِجَابٌ مِنْ النَّارِ
'Adi b. Hatim reported that the Messenger of Allah (ﷺ) made a mention of Fire. He turned his face aside and diverted his attention and then said:
Guard (yourselves) against Fire. He turned his face and diverted his attention till we thought as if he were (actually seeing it and then said: Protect yourselves against Fire even if it is with half a date, and he who does not find it, (he should do so) with pleasant words. Abu Kuraib did not mention the word: (as if).
Reference: Sahih Muslim 1016 c
In-book reference: Book 12, Hadith 86
USC-MSA web (English) reference(deprecated numbering scheme): Book 5, Hadith 2217