(25) The Book on Food
كتاب الأطعمة عن رسول الله صلى الله عليه وسلم
(11) Chapter: What Has Been Related About The Fallen Morsel
(11) باب مَا جَاءَ فِي اللُّقْمَةِ تَسْقُطُ
Jami` at-Tirmidhi 1802 
Narrated Jabir:

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.

حَدَّثَنَا قُتَيْبَةُ، حَدَّثَنَا ابْنُ لَهِيعَةَ، عَنْ أَبِي الزُّبَيْرِ، عَنْ جَابِرٍ، أَنَّ النَّبِيَّ صلى الله عليه وسلم قَالَ ‏ "‏ إِذَا أَكَلَ أَحَدُكُمْ طَعَامًا فَسَقَطَتْ لُقْمَةٌ فَلْيُمِطْ مَا رَابَهُ مِنْهَا ثُمَّ لْيَطْعَمْهَا وَلاَ يَدَعْهَا لِلشَّيْطَانِ ‏"‏ ‏.‏ قَالَ وَفِي الْبَابِ عَنْ أَنَسٍ ‏.‏
Grade :  Sahih (Darussalam)
Reference : Jami` at-Tirmidhi 1802
In-book reference : Book 25, Hadith 16
English translation : Vol. 3, Book 23, Hadith 1802