Shama-il Tirmidhi Chapter 54, Hadith Number 4 (385).

‘Aayeshah Radiyallahu ‘Anha says that Rasulullah Sallallhu ‘Alayhi Wasallam said: “We have no heirs. What we (the ambiyaa) leave is sadaqah”.

Commentary
By sadaqah it is meant that it should be spent on those to whom sadaqah is given.