Sa'id ibn al-Musayyib سعيد بن المسيب بن حزن أبو محمد القرشي · The Book of Presents

"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?'"

"The Messenger of Allah said: 'Treat your children fairly, treat your children fairly.'"