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. (Using translation from Abū Dāʾūd 3558)
قَالَ النَّبِيُّ ﷺ «الْعُمْرَى جَائِزَةٌ لِأَهْلِهَا وَالرُّقْبَى جَائِزَةٌ لِأَهْلِهَا»