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.)
Hadith Referenceمشكوة المصابيح / كتاب الزكاة / 1935
Hadith Gradingالألبانی:مُتَّفَقٌ عَلَيْهِ | زبیر علی زئی:متفق عليه
Hadith Takhrij´تحقيق و تخريج: محدث العصر حافظ زبير على زئي رحمه الله` «متفق عليه، رواه البخاري (3592) و مسلم (44/ 999)»