The Umra for which Messenger of Allah ﷺ gave sanction that a person way say: This (property) is for you and for your descendants. And when he said: That is for you as long as you live, then it will return to its owner (after the death of the donee). Ma'mar said: Zuhri used to give religious verdict according to this.  

إِنَّمَا الْعُمْرَى الَّتِي أَجَازَ رَسُولُ اللَّهِ ﷺ أَنْ يَقُولَ هِيَ لَكَ وَلِعَقِبِكَ فَأَمَّا إِذَا قَالَ هِيَ لَكَ مَا عِشْتَ فَإِنَّهَا تَرْجِعُ إِلَى صَاحِبِهَا قَالَ مَعْمَرٌ وَكَانَ الزُّهْرِيُّ يُفْتِي بِهِ  

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.  

إِنَّمَا الْعُمْرَى الَّتِي أَجَازَهَا رَسُولُ اللَّهِ ﷺ أَنْ يَقُولَ هِيَ لَكَ وَلِعَقِبِكَ فَأَمَّا إِذَا قَالَ هِيَ لَكَ مَا عِشْتَ فَإِنَّهَا تَرْجِعُ إِلَى صَاحِبِهَا  

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. (Using translation from Abū Dāʾūd 3555)  

إِنَّمَا الْعُمْرَى الَّتِي أَجَازَ رَسُولُ اللهِ ﷺ أَنْ يَقُولَ هِيَ لَكَ وَلِعَقِبِكَ فَأَمَّا إِذَا قَالَ هِيَ لَكَ مَا عِشْتَ فَإِنَّهَا تَرْجِعُ إِلَى صَاحِبِهَا  

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. (Using translation from Abū Dāʾūd 3555)  

إِنَّمَا الْعُمْرَى الَّتِي أَجَازَهَا رَسُولُ اللَّهِ ﷺ أَنْ يَقُولَ «هِيَ لَكَ وَلِعَقِبِكَ مِنْ بَعْدِكَ فَأَمَّا إِذَا قَالَ هِيَ لَكَ مَا عِشْتَ فَإِنَّهَا تَرْجِعُ إِلَى صَاحِبِهَا»