ἀντίξουν

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

Source

Russian (Dvoretsky)

ἀντίξουν: τό стяж. = ἀντίξοον.