Sahih Muslim 1016c
'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).
حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، وَأَبُو كُرَيْبٍ قَالاَ حَدَّثَنَا أَبُو مُعَاوِيَةَ، عَنِ الأَعْمَشِ، عَنْ عَمْرِو بْنِ مُرَّةَ، عَنْ خَيْثَمَةَ، عَنْ عَدِيِّ بْنِ حَاتِمٍ، قَالَ ذَكَرَ رَسُولُ اللَّهِ ﷺ النَّارَ فَأَعْرَضَ وَأَشَاحَ ثُمَّ قَالَ " اتَّقُوا النَّارَ " . ثُمَّ أَعْرَضَ وَأَشَاحَ حَتَّى ظَنَنَّا أَنَّهُ كَأَنَّمَا يَنْظُرُ إِلَيْهَا ثُمَّ قَالَ " اتَّقُوا النَّارَ وَلَوْ بِشِقِّ تَمْرَةٍ فَمَنْ لَمْ يَجِدْ فَبِكَلِمَةٍ طَيِّبَةٍ " . وَلَمْ يَذْكُرْ أَبُو كُرَيْبٍ كَأَنَّمَا وَقَالَ حَدَّثَنَا أَبُو مُعَاوِيَةَ حَدَّثَنَا الأَعْمَشُ .