The Prophet ﷺ said: Life-tenancy is lawful for the one to whom it is given and donation of property to go to the survivor is lawful to whom it is given.  

رَسُولُ ﷺ الْعُمْرَى جَائِزَةٌ لأَهْلِهَا وَالرُّقْبَى جَائِزَةٌ لأَهْلِهَا  

The Prophet ﷺ said: If anyone gives something in life-tenancy, it belongs to the one to whom it is given, in his life and after his death; and do not give property to go to the survivor, for if anyone gives something to to to the survivor, it belongs to him.  

قَالَ رَسُولُ اللَّهِ ﷺ مَنْ أَعْمَرَ شَيْئًا فَهُوَ لِمُعْمَرِهِ مَحْيَاهُ وَمَمَاتَهُ وَلاَ تُرْقِبُوا فَمَنْ أَرْقَبَ شَيئًا فَهُوَ سَبِيلُهُ  

'Umra' means that a man says to another man: It belongs to you so long as you live. When he says that, it belongs to him and to his heirs. Ruqba means that a man says to another: From me and from you.  

أَنْ يَقُولَ الرَّجُلُ لِلرَّجُلِ هُوَ لَكَ مَا عِشْتَ فَإِذَا قَالَ ذَلِكَ فَهُوَ لَهُ وَلِوَرَثَتِهِ وَالرُّقْبَى هُوَ أَنْ يَقُولَ الإِنْسَانُ هُوَ لِلآخِرِ مِنِّي وَمِنْكَ