Sunan An-Nasa'i

It was narrated from An-Nu'man that his father brought him to the Prophet to bear witness to a present that he gave to him. He said:""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)