Parallel
2 Thessalonians 2:15
Patriarchal Greek New Testament (1904) · Berean Standard Bible
Ἄρα οὖν, ἀδελφοί, στήκετε, καὶ κρατεῖτε τὰς παραδόσεις ἃς ἐδιδάχθητε εἴτε διὰ λόγου εἴτε δι᾽ ἐπιστολῆς ἡμῶν.
Therefore, brothers, stand firm and cling to the traditions we taught you, whether by speech or by letter.