γράφειν καὶ συσσημαίνεσθαι
From LSJ
Δούλου γὰρ οὐδὲν χεῖρον οὐδὲ τοῦ καλοῦ → Res nulla servo peior est, etiam bono → Ein Sklave ist das schlechteste, selbst wenn er gut
Greek > English (Woodhouse)
sign and witness its being sealed, sign a document and witness its being sealed