Musannaf Ibn Abi Shaybah

Hazrat Saeed bin Al-Musayyib says that a slave should not give charity to his father or mother without the master's permission.

Hazrat Dirham narrates that I asked Hazrat Abu Hurairah, "My master gives me one dirham a day. Can I give it in charity?" He replied, "It is not permissible for you to give anything from your blood or your wealth in charity without your master's permission. So, just feed a morsel to the needy (this is sufficient for you)."

Hazrat Ata says that a slave will not give charity without the permission of his master.

Hazrat Ismail bin Sulaiman says that I was present with Hazrat Sha’bi when a slave asked him, “I earn such and such amount, and from it my master takes such and such portion. Can I give charity from it?” He replied, “(If you give charity) its reward will be for your master.”