"Aishah had a male slave and a female slave. She said: 'I wanted to set them free, and I mentioned that to the Messenger of Allah. He said: Start with the male slave before the female slave.'" (Using translation from Nasāʾī 3446)  

أَنْ أُعْتِقَهُمَا فَذَكَرْتُ ذَلِكَ لِرَسُولِ اللهِ ﷺ فَقَالَ «ابْدَئِي بِالْغُلَامِ قَبْلَ الْجَارِيَةِ»