Chapter 25: The Book of Gifts
Nu' man b. Bashir (Allah be pleased with them) reported: My father took me to Allah' s Messenger (ﷺ) and said: Allah' s Messenger, bear witness that I have given such and such gift to Nu' man from my property, whereupon he (the Holy Prophet) said: Have you conferred upon all of your sons as you have conferred upon Nu' man? He said: No. Thereupon he (the Holy Prophet) said: Call someone else besides me as a witness. And he further said: Would it, please you that they (your children) should all behave virtuously towards you? He said: Yes. He (the Holy Prophet) said: Then don' t do that (i e. don' t give gift to one to the exclusion of others).
Sahih Muslim 1623i