He came to the gathering of the Ansar and said, "The Prophet of Allah ﷺ forbade us today from certain things." He then mentioned several matters and forbade the earnings of a slave-girl except for what she produced with her own hands, gesturing with his fingers to indicate things like baking bread, spinning, and carding wool.
حدثنا هارون بن عبد الله حدثنا هاشم بن القاسم حدثنا عكرمة حدثني طارق بن عبد الرحمن القرشي قال جاء
إلى مجلس الأنصار فقال لقد نهانا نبي الله ﷺ اليوم فذكر أشياء ونهى عن كسب الأمة إلا ما عملت بيدها وقال هكذا بأصابعه نحو الخبز والغزل والنفش
[Hasan] Ahmad narrated it: 4/341, from Hashim bin Qasim, through this route. Hakim graded it sahih: 2/42, but Dhahabi disputed him, and the correct view is otherwise. It has corroborating narrations.