Abdullah bin Mubarak عبد الله بن المبارك · The Book of Presents

"O Prophet of Allah, I have given An-Nu'man a present." He said: "Have you given something to his brothers?" He said: "No." He said: "Then take it back."

"I have given a gift to my son, so bear witness." He said: "Do you have any other children?" He said: "Yes." He said: "Have you given them something like that which you have given him?" He said: "No." He said: "Shall I bear witness to unfairness?"