His father brought him to the Prophet ﷺ to have him bear witness to a gift he had given him. The Prophet ﷺ asked, "Have you given every one of your children a gift like the one you gave to this son?"He replied, "No."The Prophet ﷺ said, "Then I will not bear witness to anything. Would it not please you that they all treat you equally in kindness?"He said, "Yes, of course."The Prophet ﷺ said, "Then no."
أخبرنا محمد بن المثنى عن عبد الوهاب قال حدثنا داود عن عامر
أتى به النبي ﷺ يشهد على نحل نحله إياه فقال أكل ولدك نحلت مثل ما نحلته قال لا قال فلا أشهد على شيء أليس يسرك أن يكونوا إليك في البر سواء قال بلى قال فلا إذا
Its isnad is sahih. See the previous hadith. It is in Kubra, hadith 6507.Amir is Shaybi, Dawud is Ibn Abu Hind, and Abdul-Wahhab is Thaqafi.