"Have you given all your children a present like that which you have given to him?" He said: "No." He said: "I will not bear witness to anything. Will it not please you if they were all to treat you with equal respect?" He said: "Of course." He said: "Then no (I will not do it)."
Sunan an-Nasa'i Book 31, Hadith 9
← Previous Hadith "Bear witness that I have given An-Nu'man such and such of my wealth as a gift." He said: "Have you given all your children a present like that which you have given to An-Nu'man?"

Sunan an-Nasa'i Book 31, Hadith 8 Next Hadith → "I will not be pleased until you ask the Messenger of Allah to bear witness." He said: "O Messenger of Allah, the mother of this boy, the daughter of Rawahah, insisted that I give a gift to him." The Messenger of Allah said: "O Bashir, do you have any other children besides this one?" He said: "Yes." The Messenger of Allah said: "Have you given all of them a gift like that which you have given to this son of yours?" He said: "No." The Messenger of Allah said: "Then do not ask me to bear witness, for I will not bear witness to unfairness."

Sunan an-Nasa'i Book 31, Hadith 10