An-Nu'man ibn Bashir said that his father had carried him to the Messenger of Allah (ﷺ). 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."
Reference: Al-Adab Al-Mufrad 93 In-book : Book 5, Hadith 10 English translation : Book 5, Hadith 93
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