Abu Hurayrah Radiyallahu 'Anhu reports that Faatimah (Radiyallahu 'Anha) came to Abubakr (Siddique Radiyallahu 'Anhu) and asked him who his heirs were. He replied:
''My wife and children''. (Faatimah Radiyallahu 'Anha asked:) ''Then why did I not become heir to my fathers estate?'' Abubakr (Siddique Radiyallahu 'Anhu) Said: "I heard the command of Rasulullah Sallallhu 'Alayhi Wasallam, that we do not leave any heirs. But (I being a guardian of the waqf) for those whom Rasulullah Sallallahu 'Alayhi Wasallam had decreed a daily allowance, I will continue to grant it. And on whom Rasulullah Sallallahu 'Alayhi Wasallam used to spend. I will continue to spend".
English reference: Book 54, Hadith 383
Arabic reference: Book 55, Hadith 400