Mishkat al-Masabih 11 Business Transactions كتاب البيوع 245

وَعَنْهُ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «أَيُّمَا رَجُلٍ أُعْمِرَ عمرى لَهُ ولعفبه فَإِنَّهَا الَّذِي أعطيها لَا ترجع إِلَى الَّذِي أَعْطَاهَا لِأَنَّهُ أَعْطَى عَطَاءً وَقَعَتْ فِيهِ الْمَوَارِيث»

He reported God’s Messenger as saying, “If anyone has property [[given him 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.” (Bukhari and Muslim.)