Ibn Majah

"Bear witness that I have given Nu'man such and such from my wealth." He said: "Have you given all your children something like that which you have given to Nu'man?" He said: "No." He said: "Then let someone other than me bear witness to that." And he said: "Would you not like all your children to honor you equally?" He said: "Of course." He said: "Then do not do this."

his father gave him a gift of a slave, and he came to the Prophet (ﷺ) so that he could witness the gift. He said: "Have you given something to all of your children?" He said: "No." He said: "Then take back (your gift)."

"It is not permissible for a man to give a gift then take it back, except what a father gives to his child."

"None of you should take back his gift, except a father (taking it back) from his son."

"There is no lifelong grant. Whoever is given something as a lifelong grant, it is his.' "

"I heard the Messenger of Allah (ﷺ) say: 'Whoever gives a lifelong grant to a man, it belongs to him (the recipient) and to his heirs. His (the giver's) words put an end to his right to it, and it belongs to the one to whom it was given for life and to his heirs."

the Prophet (ﷺ) ruled that a gift given for life belongs to the heirs (of the recipient).

"There is no Ruqba. Whoever is given a gift on the basis of Ruqba, it belongs to him, whether he lives or dies."

"Umra belongs to the one to whom it is given, and Ruqba belongs to the one to whom it is given."

"The likeness of one who takes back his gift is that of a dog that eats until it is full and vomits; then it goes back to its vomit and eats it again."