Rafi' ibn Rifa'ah came to a meeting of the Ansar and said: The Prophet of Allah ﷺ forbade us (from some things) today, and he mentioned some things. He forbade the earning of a slave-girl except what she earned with her hand. He indicated (some things) with his fingers such as baking, spinning, and ginning. (Using translation from Abū Dāʾūd 3426)
لَقَدْ نَهَانَا رَسُولُ اللَّهِ ﷺ الْيَوْمَ فَذَكَرَ أَشْيَاءَ وَقَالَ «نَهَانَا عَنْ كَسْبِ الْأَمَةِ إِلَّا مَا عَمِلَتْ بِيَدِهَا وَقَالَ هَكَذَا بِأُصْبُعِهِ نَحْوَ الْغَزْلِ وَالْخُبْزِ وَالنَّفْشِ»