Ibn Ka'b b. Malik reported on the authority of his father that the Messenger of Allah ﷺ used to eat (food) with three fingers and he licked his hand before wiping it (with towel). (Using translation from Muslim 2032b)
كَانَ رَسُولُ اللهِ ﷺ يَأْكُلُ بِثَلَاثِ أَصَابِعَ وَيَلْعَقُ يَدَهُ قَبْلَ أَنْ يَمْسَحَهَا