‏الأشربة : Hadeeth No:5037 Ibn 'Abbas reported Allaah's Messenger (sallAllaahu alayhi wa sallam.) as saying: When any one of you eats food he should not wipe his hand until he has licked it himself or has given it to someone else to lick....

‏الزكاة : Hadeeth No:2203 This hadith has been narrated by Shu'ba with the same chain of transmitters....