The Messenger of Allah ﷺ said, "Be just between your children. Be just between your sons."
حدثنا سليمان بن حرب حدثنا حماد عن حاجب بن المفضل بن المهلب عن أبيه قال سمعت
قال رسول الله ﷺ اعدلوا بين أولادكم اعدلوا بين أبنائكم
No references are available.
Its chain of transmission is sahih. Nasai narrated it in the chapter on Gifts, in the section on the variation in the wordings of those who transmitted the report of Numan bin Bashir concerning gifts, hadith no. 3717, from Sulayman bin Harb, with this wording.