Ignatius — Epistle to the Ephesians 13
Take heed, then, often to come together to give thanks to God, and show forth His praise. For when you assemble frequently in the same place, the powers of Satan are destroyed, and the destruction at which he aims is prevented by the unity of your faith. Nothing is more precious than peace, by which all war, both in heaven and earth, is brought to an end.
Greek
Σπουδάζετε οὖν πυκνότερον συνέρχεσθαι εἰς εὐχαριστίαν θεοῦ καὶ εἰς δόξαν. ὅταν γὰρ πυκνῶς ἐπὶ τὸ αὐτὸ γίνεσθε, καθαιροῦνται αἱ δυνάμεις τοῦ Σατανᾶ, καὶ λύεται ὁ ὄλεθρος αὐτοῦ ἐν τῇ ὁμονοίᾳ ὑμῶν τῆς πίστεως. οὐδέν ἐστιν ἄμεινον εἰρήνης, ἐν ᾗ πᾶς πόλεμος καταργεῖται ἐπουρανίων καὶ ἐπιγείων.