5 chains merged

Ibn Ka'b b. Malik reported on the authority of his father that he saw Allah's Messenger (ﷺ) licking his three fingers (after having finished the food). Ibn Hatim made no mention of" three". This hadith is also narrated through another chain

The Prophet (ﷺ) used to eat with three fingers and not wipe his before licking it.

"The Prophet (ﷺ) used to lick his fingers three times.”

“When the Prophet (ﷺ) ate a meal, he used to lick his three fingers [the thumb, the index finger and the middle finger].”

"Allah’s Messenger (ﷺ) used to eat with his three fingers and afterwards he would lick them.”