2 Thessalonians 2:15; 2 Thessalonians 3:6

2 Thessalonians 2:15

15 So then, brethren, stand firm and hold to the traditions which you were taught, whether by word of mouth or by letter from us.

2 Thessalonians 3:6

6 Now we command you, brethren, in the name of our Lord Jesus Christ, that you keep away from every brother who leads an unruly life and not according to the tradition which you received from us.