Salah bin Kaysan al-Madni صالح بن كيسان المدني أبو محمد · Wages (Kitab Al-Ijarah)

The Messenger of Allah (ﷺ) as saying: If anyone has property given him in life-tenancy for the use of himself and his descendants, it belongs to the one to whom it is given and does not return to the one who gave it, because he gave a gift which may be inherited.