(3) باب كَرَاهَةِ تَفْضِيلِ بَعْضِ الأَوْلاَدِ فِي الْهِبَةِ
Nu'man b. Bashir, reported that Allah's Messenger (ﷺ) had said:
Have you, besides him, other sons? He said: Yes. Thereupon he (the Holy Prophet) said: Have you given gifts to all of them like this (as you have given to Nu'man)? He said: No. Thereupon he (the Holy Prophet) said: I cannot bear witness to an injustice.
Reference: Sahih Muslim 1623 g
In-book reference: Book 24, Hadith 21
USC-MSA web (English) reference(deprecated numbering scheme): Book 12, Hadith 3967