‏الزهد والرقائق‏ : Hadeeth No:7084 'A'isha reported Allaah's Messenger (sallAllaahu alayhi wa sallam) as saying: Never did Allaah's Messenger (sallAllaahu alayhi wa sallam) eat to his fill the bread of wheat for three successive days until he had run the course of his life....

‏الزكاة : Hadeeth No:2275 Ibn al-Sa'di Maliki reported: 'Umar b. Khattab (Allaah be pleased with him) appointed me as a collector of Sadaqa. When I had finished that (the task assigned to me) and I handed over that to him (to 'Umar), he commanded me to (accept) some remuneration (for the work). I said: I performed this duty ...