Mukhtasar Bukhari (Abridged) 1906 — Licking and sucking fingers before

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."