حَدَّثَنَا مُحَمَّدُ بْنُ فُضَيْلٍ حَدَّثَنَا حُصَيْنٌ عَنْ مُجَاهِدٍ عَنِ ابْنِ عُمَرَ أَنَّهُ كَانَ يَلْعَقُ أَصَابِعَهُ ثُمَّ يَقُولُ قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ إِنَّكَ لَا تَدْرِي فِي أَيِّ طَعَامِكَ تَكُونُ الْبَرَكَةُ
مسند امام احمد بن حنبل · Hadith 4514
It was narrated from Ibn 'Umar that he used to lick his fingers (after eating), then say: The Messenger of Allah (PBUH) said: "You do not know in which part of your food the barakah (blessing) is."
Translated by Dr. Muhammad Muhsin Khan · Reviewed by Islamic University of Madinah · Published March 2020