Sunan Abu Dawud
3555
Sahih+3

Narrated Jabir bin ‘Abdullah :The life-tenancy which the Messenger of Allah (ﷺ) allowed was only that one should say: It is for you and your descendants. When he says: It is yours as long as you live, it returns to its owner

SahihAl-Albani
SahihMuhammad Muhyi Al-Din Abdul Hamid