Sahih Muslim 1625 c
Jabir b. 'Abdullah al-Ansari (Allah be pleased with him) said:
Allah's Messenger (ﷺ) said: Whoever a person conferred Umra (life grant) upon a person and he says: I confer upon you this and upon your descendants and anyone who survives you, and that becomes his possession and that of his posterity. It would become (a permanent possession) of those who were conferred upon this gift, and it would not return to its owner (donor), for he gave that as a gift in which accrued the right of inheritance.
حَدَّثَنِي عَبْدُ الرَّحْمَنِ بْنُ بِشْرٍ الْعَبْدِيُّ، أَخْبَرَنَا عَبْدُ الرَّزَّاقِ، أَخْبَرَنَا ابْنُ جُرَيْجٍ، أَخْبَرَنِي ابْنُ شِهَابٍ، عَنِ الْعُمْرَى، وَسُنَّتِهَا، عَنْ حَدِيثِ أَبِي سَلَمَةَ بْنِ عَبْدِ الرَّحْمَنِ، أَنَّ جَابِرَ بْنَ عَبْدِ، اللَّهِ الأَنْصَارِيَّ أَخْبَرَهُ أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ ‏
"‏ أَيُّمَا رَجُلٍ أَعْمَرَ رَجُلاً عُمْرَى لَهُ وَلِعَقِبِهِ فَقَالَ قَدْ أَعْطَيْتُكَهَا وَعَقِبَكَ مَا بَقِيَ مِنْكُمْ أَحَدٌ ‏.‏ فَإِنَّهَا لِمَنْ أُعْطِيَهَا ‏.‏ وَإِنَّهَا لاَ تَرْجِعُ إِلَى صَاحِبِهَا مِنْ أَجْلِ أَنَّهُ أَعْطَى عَطَاءً وَقَعَتْ فِيهِ الْمَوَارِيثُ ‏"‏ ‏.‏