ἄλογον δὴ τὸ μήτε μάχης ἄρξασθαι μήτε τοὺς φίλους φυλάξαι, ἐὰν ὑπό γε τῶν βαρβάρων ἀδικῆσθε → It is irrational neither to begin battle nor to guard the friends, if you are ever wronged by the foreigners
See clean.
Cleanse from guilt, etc.: P. and V. καθαίρειν, ἐκκαθαίρειν, V. ἁγνίζειν, νίζειν, Ar. and P. διακαθαίρειν; see purify.