عَنْ أَنَسٍ رَضِيَ اللَّهُ عَنْهُ أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ قَالَ إِذَا سَقَطَتْ لُقْمَةُ أَحَدِكُمْ فَلْيَأْخُذْهَا وَلْيَمْسَحْ مَا بِهَا مِنَ الْأَذَى وَلَا يَدَعْهَا لِلشَّيْطَانِ
Sayyiduna Anas (may Allah be pleased with him) narrates that the Noble Prophet (peace and blessings be upon him) said: When a morsel falls from the hand of any one of you, he should pick it up, clean off anything attached to it, and eat it, and not leave it for Satan.