‏الأشربة : Hadeeth No:5038 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 or got it licked by (someone else)....

‏الطهارة : Hadeeth No:439 This hadith is also narrated on the authority with the same chain of transmitters and in the hadith of Abu Usama the words are:" He who performed the ablution well and then offered the obligatory prayer."...