Riyad as-Salihin #1541
The Book of Miscellany
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وعن أم المؤمنين ميمونة بنت الحارث رضي الله عنها أنها أعتقت وليدة ولم تستأذن النبي صلى الله عليه وسلم، فلما كان يومها الذي يدور عليها فيه، قالت: أشعرت يا رسول الله أني أعتقت وليدتي؟ قال: "أو فعلت؟" قالت: نعم.
قال: "أما إنك لو أعطيتها أخوالك كان أعظم لأجرك" ((متفق عليه)).
It has been narrated that Maimuna bint Al-Harith (May Allah be pleased with her) had set free a slave-girl without the Prophet's permission. When her turn came (the Prophet (ﷺ) used to visit his wives in turns), she made mention of that to him saying, "Did you know I have set slave-girl free?" He said, "Have you, indeed?" She replied, "Yes". He (ﷺ) then remarked, "Had you given her to your maternal uncles, you would have your reward increased"..
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About Riyad as-Salihin
This hadith is #1541 from Riyad as-Salihin, in the Book of The Book of Miscellany.