وَعَنْ جَابِرٌ
أَنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ أَمَرَ بِلَعْقِ الْأَصَابِعِ وَالصَّفْحَةِ وَقَالَ: «إِنَّكُمْ لَا تَدْرُونَ: فِي أَيَّهِ الْبَرَكَةُ؟»
Jabir said the Prophet (sallallahu alayhi wa sallam) ordered people to lick their fingers and the dish, saying, “You do not know in what portion blessing lies.”
Mishkat al-Masabih 3999, Book 22, Foods, Hadith 7. 1 min read