‏القدر : Hadeeth No:6419 Tawus reported: I found some Companions of Allaah's Messenger (sallAllaahu alayhi wa sallam) as saying: Everything is by measure. And he further said: I heard Abdullah b. 'Umar as saying: There is a neasure for everything-even for incapacity and-capability....

‏الصيام : Hadeeth No:2444 A hadith like this has been narrated by Yahya b. Abu Kathir with the same chain of transmitters....