The Prophet ﷺ said, 'When you eat, do not wipe your hands till you have licked it, or had it licked by somebody else."  

أَنَّ النَّبِيَّ ﷺ قَالَ إِذَا أَكَلَ أَحَدُكُمْ فَلاَ يَمْسَحْ يَدَهُ حَتَّى يَلْعَقَهَا أَوْ يُلْعِقَهَا