What did the Prophet Muhammad (peace be upon him) say in response to Sa'd bin 'Ubada Al-Ansari's question regarding a vow made by his mother who died before fulfilling it?
      Narrated Ibn Abbas:                          Sa'd bin 'Ubada Al-Ansari sought the verdict of Allah's Apostle      regarding a vow made by his mother who had died before fulfilling it.      Allah's Apostle said, "Fulfill it on her behalf." Some people said,      "If the number of camels reaches twenty, then their owner has to pay      four sheep as Zakat; and if their owner gives them as a gift or sells      them in order to escape the payment of Zakat cunningly before the      completion of a year, then he is not to pay anything, and if he      slaughters them and then dies, then no Zakat is to be taken from his      property."