Yoreh Deah Siman 267 Seif 54

נד כָּל הַכָּשֵׁר לְהָבִיא גֵּט הָאִשָּׁה כָּשֵׁר לְהָבִיא גֵּט הָעֶבֶד.

 

Seif 54

Everyone who is acceptable to bring a bill of divorce to a woman (as the husband’s agent) is also acceptable to bring a bill of release for a slave (as the agent of the master.)