An-Nu'man ibn Bashir said that his father had carried him to the Messenger of Allah, may Allah bless him and grant him peace. He said, 'Messenger of Allah, I testify to you that I have given an-Nu'man such-and-such. (It was a slave). The Prophet asked, "Have you given each of your children the same"?" "No," he replied. He said, "Then testify to someone other than me." Then the Prophet asked, "Do you not want to show equal kindness to all of them?" "Indeed I do," he replied. He said, "Then do not do it."