It was narrated that ‘Aishah said: “The Messenger of Allah (ﷺ) entered the house and saw a piece of bread that had been thrown (on the floor). He picked it up, wiped it and ate it, and said: ‘O ‘Aishah, show honor to the precious (i.e., food), for is the blessing of food departs from people, it never comes back.’”
Source: sunnah.com
Other translations
Arabic
حَدَّثَنَا إِبْرَاهِيمُ بْنُ مُحَمَّدِ بْنِ يُوسُفَ الْفِرْيَابِيُّ، حَدَّثَنَا وَسَّاجُ بْنُ عُقْبَةَ بْنِ وَسَّاجٍ، حَدَّثَنَا الْوَلِيدُ بْنُ مُحَمَّدٍ الْمُوَقَّرِيُّ، حَدَّثَنَا الزُّهْرِيُّ، عَنْ عُرْوَةَ، عَنْ عَائِشَةَ، قَالَتْ دَخَلَ النَّبِيُّ ـ صلى الله عليه وسلم ـ الْبَيْتَ فَرَأَى كِسْرَةً مُلْقَاةً فَأَخَذَهَا فَمَسَحَهَا ثُمَّ أَكَلَهَا وَقَالَ " يَا عَائِشَةُ أَكْرِمِي كَرِيمَكِ فَإِنَّهَا مَا نَفَرَتْ عَنْ قَوْمٍ قَطُّ فَعَادَتْ إِلَيْهِمْ " .
sunnah.com