πιστοῦσθαι
From LSJ
οὕτως εἴη ἡμίν ὁ Θεός βοηθός καὶ τὸ ἱερὸν Αὐτοῦ Εὐαγγέλιον ὧδε ἐμφανισθέντα-ὁρκισθέντα → so help us God and Ηis holy Gospel the things here declared and sworn
Greek > English (Woodhouse Verbs Reversed)
(see also πιστόω): give security, pledge one's troth, pledge oneself
