Chapter 31: The Book of Presents
An-Nu' man bin Bashir said: "My father took me to the Prophet to ask him to bear witness to something that he had given to me. He said: 'Do you have any other children?' He said: 'Yes.' He gestured with his hand held horizontally like this, (saying): 'Why don' t you treat them all equally?'"
Sunan an-Nasa'i 3685