Sahih Adab al-Mufrad

It is narrated from Sayyiduna Nu’man bin Bashir (may Allah be pleased with him), who said that his father took him and presented him before the Messenger of Allah (peace and blessings of Allah be upon him). And (his father) said to the Messenger (peace be upon him), “O Messenger of Allah! I want to make you a witness that I have given Nu’man such and such things.” The Prophet (peace be upon him) said: “Have you given this gift to all your children?” He replied: “No.” The Prophet (peace be upon him) said: “Then make someone else a witness.” After that, the Prophet (peace be upon him) said: “Do you not like that all your children should be equal in showing kindness to you?” He replied: “Why not.” The Prophet (peace be upon him) said: “Then do not do this.” Abu Abdullah Bukhari (may Allah have mercy on him) says: The testimony of the Prophet (peace be upon him) will not be considered as permission.