Therefore, brethren, stand fast and hold the traditions which you were taught, whether by word or our epistle.
2 Thessalonians 2:15
Surrounding context
2:14 to which He called you by our gospel, for the obtaining of the glory of our Lord Jesus Christ.
2:15 Therefore, brethren, stand fast and hold the traditions which you were taught, whether by word or our epistle.
2:16 Now may our Lord Jesus Christ Himself, and our God and Father, who has loved us and given us everlasting consolation and good hope by grace,