ἐπέμψατε ἀγγέλους τοῖς ἀλλήλοις ὥστε ἔγνωτε τὸν κίνδυνον → you sent messengers to one another so that you knew the danger
ὄμνυμι, ὀμνύω, διόμνυμι, ὁρκωμοτέω, ἐπιορκέω