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.
Sunan Abi Dawud Book 24, Hadith 143
← Previous Hadith The Messenger of Allah (ﷺ) decided a case of a woman from the Ansar to whom an orchard of date-palms was given by her son. She then died. Her son said: I gave it to her for her life, and she has brothers. Thereupon the Messenger of Allah (ﷺ) said: It belongs to her during her life and after death. He then said: I gave a sadaqah (charity to her. He replied: It is more unexpected from you.

Sunan Abi Dawud Book 24, Hadith 142 Next Hadith → 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.

Sunan Abi Dawud Book 24, Hadith 144