Sunan Ibn Majah, Book 29, Hadith 3404 (In-Book) ⓘ
It was narrated from Jabir that the Messenger of Allah said: “If a morsel falls from the hand of anyone of you, let him wipe off whatever dirt that is on it and eat it.”
حَدَّثَنَا عَلِيُّ بْنُ الْمُنْذِرِ، حَدَّثَنَا مُحَمَّدُ بْنُ فُضَيْلٍ، حَدَّثَنَا الأَعْمَشُ، عَنْ أَبِي سُفْيَانَ، عَنْ جَابِرٍ، قَالَ قَالَ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ " إِذَا وَقَعَتِ اللُّقْمَةُ مِنْ يَدِ أَحَدِكُمْ فَلْيَمْسَحْ مَا عَلَيْهَا مِنَ الأَذَى وَلْيَأْكُلْهَا " .
also referenced under: Hadith 3279 (Reference) & Volume 4, Book 29, Hadith 3279 (DarusSalam)