وَعَنِ ابْنِ عَبَّاسٍ
أَنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: «إِذَا أَكَلَ أَحَدُكُمْ فَلَا يمسحْ يدَه حَتَّى يلعقها أَو يلعقها»
The Prophet (sallallahu alayhi wa sallam) said:, “When one of you eats he must not wipe his hand till he licks it, or gives it to someone to lick.”
Mishkat al-Masabih 4000, Book 22, Foods, Hadith 8. 1 min read