«إن الله إذا أطعم نبيا طعمة فهي للذي يقوم من بعده»
The Prophet (peace and blessings be upon him) said:
"Indeed, when Allah Almighty grants a Prophet some provision (property or wealth), it belongs (after his death) to the one who succeeds him after him (that is, his caliph) (inheritance does not apply to it)."
Hadith Referenceصحیح الجامع الصغیر / حرف الألف / 1709