صحيح البخاري
Sahih Bukhari
كتاب الوصايا
The Book of Wasaya (Wills and Testaments)
باب إذا وقف شيئا فلم يدفعه إلى غيره، فهو جائز:
Chapter. If one declares his wish to found an endowment, his endowment is valid even before its conveyance (to those for whom it is intended).
