Nu'man b. Bashir reported that his father had donated a slave to him. Allah's Messenger (may peace he upon him) said: Who is this slave (how have you come to possess it)? Thereupon he (Nu'man b. Bashir) said: My father has donated it to me, whereupon he said: Have all brothers (of yours) been given this gift as given to you? He said: No. Thereupon he (the Holy Prophet) said: Then return him.
Source: sunnah.com
Other translations
Arabic
حَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، حَدَّثَنَا جَرِيرٌ، عَنْ هِشَامِ بْنِ عُرْوَةَ، عَنْ أَبِيهِ، قَالَ حَدَّثَنَا النُّعْمَانُ بْنُ بَشِيرٍ، قَالَ وَقَدْ أَعْطَاهُ أَبُوهُ غُلاَمًا فَقَالَ لَهُ النَّبِيُّ صلى الله عليه وسلم " مَا هَذَا الْغُلاَمُ " . قَالَ أَعْطَانِيهِ أَبِي . قَالَ " فَكُلَّ إِخْوَتِهِ أَعْطَيْتَهُ كَمَا أَعْطَيْتَ هَذَا " . قَالَ لاَ . قَالَ " فَرُدَّهُ " .
sunnah.com