נג וּכְשֵׁם שֶׁהָאִשָּׁה אוֹמֶרֶת: בְּפָנַי נִכְתַּב וּבְפָנַי נֶחְתַּם, אִם הִתְנָה עָלֶיהָ, כֵּן הָעֶבֶד.
Seif 53
Just as the woman must say: “It was written and signed in my presence,” when it was stipulated that she do so, as we have explained in that context, the same applies for a servant/slave.