That the Prophet ﷺ said: "When one of you eats food, and he drops a pieces of it, then let him remove anything suspicious from it and eat it. Do not leave it for Ash-Shaitan." He said: There is something about this from Anas.  

أَنَّ النَّبِيَّ ﷺ قَالَ إِذَا أَكَلَ أَحَدُكُمْ طَعَامًا فَسَقَطَتْ لُقْمَةٌ فَلْيُمِطْ مَا رَابَهُ مِنْهَا ثُمَّ لْيَطْعَمْهَا وَلاَ يَدَعْهَا لِلشَّيْطَانِ قَالَ وَفِي الْبَابِ عَنْ أَنَسٍ  

"When the Prophet ﷺ ate, he would lick his three fingers, and he said: 'If one of you drops a piece (of food) then let him remove any harm (dirt) from it and eat it, and do not leave it for Ash-Shaitan.' And he would order us to finish (clean) the dish. And he said: 'Indeed you do not know in which part of your food is the blessing.'  

أَنَّ النَّبِيَّ ﷺ كَانَ إِذَا مَا أَكَلَ طَعَامًا لَعِقَ أَصَابِعَهُ الثَّلاَثَ وَقَالَ إِذَا مَا وَقَعَتْ لُقْمَةُ أَحَدِكُمْ فَلْيُمِطْ عَنْهَا الأَذَى وَلْيَأْكُلْهَا وَلاَ يَدَعْهَا لِلشَّيْطَانِ وَأَمَرَنَا أَنْ نَسْلُتَ الصَّحْفَةَ وَقَالَ إِنَّكُمْ لاَ تَدْرُونَ فِي أَىِّ طَعَامِكُمُ الْبَرَكَةُ  

"My grandmother, Umm 'Asim narrated to me - and she was the slave woman of Sinan bin Salamah - she said: 'Nubaishah Al-Khair entered upon us while we were eating from a large bowl. He narrated to us that the Messenger of Allah ﷺ said: "Whoever eats from A Qas'ah, then licks it, the Qas'ah will seek forgiveness for him."  

دَخَلَ عَلَيْنَا نُبَيْشَةُ الْخَيْرِ وَنَحْنُ نَأْكُلُ فِي قَصْعَةٍ فَحَدَّثَنَا أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ مَنْ أَكَلَ فِي قَصْعَةٍ ثُمَّ لَحِسَهَا اسْتَغْفَرَتْ لَهُ الْقَصْعَةُ