'Aayeshah Radiyallahu 'Anha says that Rasulullah Sallallhu 'Alayhi Wasallam said:
"We have no heirs. What we (the ambiyaa) leave is sadaqah" (JA)
English reference (JA): Book 54, Hadith 385 (JA)
Arabic reference (JA): Book 55, Hadith 402 (JA)