ENOfficial
Maimuna daughter of al-Harith told that she set free a girl in the time of God’s messenger, and when she mentioned that to him he said, “If you had given her to your maternal uncles it would have increased your reward.” (Bukhari and Muslim.)
Source: sunnah.com
Other translations
Arabic
وَعَنْ مَيْمُونَةَ بِنْتِ الْحَارِثِ: أَنَّهَا أَعْتَقَتْ وَلِيدَةً فِي زَمَانِ رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فَذَكَرَتْ ذَلِكَ لِرَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فَقَالَ: «لَوْ أَعْطَيْتِهَا أخوالك كَانَ أعظم لأجرك»
sunnah.com