Mukhtasar Bukhari

Narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that the Noble Prophet (peace and blessings of Allah be upon him) said: "When any of you eats, he should not wipe his hand until he has licked (his fingers) himself or has had them licked by someone else."

Narrated Jabir bin Abdullah (may Allah be pleased with him): In the time of the Prophet (peace and blessings of Allah be upon him), we did not have napkins (to clean our hands after eating). Our palms were all we had. (We would wipe them on) our arms, feet, etc. (We would rub them and then perform prayer, without performing ablution again.)