Anas ibn Malik reported: The Messenger of Allah, peace and blessings be upon him, would lick what he ate with his three fingers during a meal, saying, “When one of you drops a mouthful, he should remove any filth from it and then eat it. He should not leave it for the devil.” The Prophet commanded us to wipe clean our dishes, saying, “Verily, you do not know in which portion of your food is the blessing.”
Source: Ṣaḥīḥ Muslim 2034
Grade: Sahih (authentic) according to Muslim
عَنْ أَنَسٍ أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ كَانَ إِذَا أَكَلَ طَعَامًا لَعِقَ أَصَابِعَهُ الثَّلَاثَ قَالَ وَقَالَ إِذَا سَقَطَتْ لُقْمَةُ أَحَدِكُمْ فَلْيُمِطْ عَنْهَا الْأَذَى وَلْيَأْكُلْهَا وَلَا يَدَعْهَا لِلشَّيْطَانِ وَأَمَرَنَا أَنْ نَسْلُتَ الْقَصْعَةَ قَالَ فَإِنَّكُمْ لَا تَدْرُونَ فِي أَيِّ طَعَامِكُمْ الْبَرَكَةُ
2034 صحيح مسلم كتاب الأشربة باب استحباب لعق الأصابع والقصعة وأكل اللقمة الساقطة بعد مسح ما يصيبها من أذى وكراهة مسح اليد قبل لعقها
