When any one of you eats food he should lick his fingers, for he does not know in what part of the food sticking to his fingers the blessing lies. (Using translation from Muslim 2035a)

أَنَّ النَّبِيَّ ﷺ قَالَ إِذَا أَكَلَ أَحَدُكُمْ فَلْيَلْعَقْ أَصَابِعَهُ فَإِنَّهُ لَا يَدْرِي فِي أَيِّ ذَلِكَ الْبَرَكَةُ