Hadith 3270
Chapter 9: Licking the fingers - كتاب الأطعمة
حَدَّثَنَا مُوسَى بْنُ عَبْدِ الرَّحْمَنِ، أَنْبَأَنَا أَبُو دَاوُدَ الْحَفَرِيُّ، عَنْ سُفْيَانَ، عَنْ أَبِي الزُّبَيْرِ، عَنْ جَابِرٍ، قَالَ قَالَ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ " لاَ يَمْسَحْ أَحَدُكُمْ يَدَهُ حَتَّى يَلْعَقَهَا فَإِنَّهُ لاَ يَدْرِي فِي أَىِّ طَعَامِهِ الْبَرَكَةُ " .
It was narrated from Jabir that the Messenger of Allah (ﷺ) said:
“None of you should wipe his hand until he has licked it, for he does not know where the blessing if in his food.’”
Reference : Sunan Ibn Majah 3270
In-book reference : Book 29, Hadith 20