2 Thessalonians 2:15
So then, brothers, stand firm and hold to the precepts (Greek: paradosis: traditions of doctrines, teachings handed down) you were taught by word of mouth or by letter from us.
1 Corinthians 11:2
Now I praise you, brothers, because you remember me in all things, and carefully follow the teachings (precepts) (doctrine) just as I delivered them to you.
1 Corinthians 16:13
Be alert (be watchful) and stand fast (be vigilant) (persevere) in the faith, carry on as men (be courageous), be strong. (Ps 31:24)
2 Thessalonians 2:2
do not get upset right away or alarmed when someone claims that we said through some spirit, conversation, or letter that the Day of Jehovah has already come. (Isaiah 13:6) (Zephaniah 1:14) (2 Peter 3:10)
2 Thessalonians 3:6
Our friends, we command you in the name of our Lord Jesus Christ to keep away from all believers who walk disorderly and who do not follow the instructions that we gave them.
Romans 16:17
Now I beseech you, brothers, mark those who cause divisions and offenses contrary to the doctrine you have learned and avoid them.
1 Corinthians 15:58
Therefore, my beloved brothers, be steadfast and unmovable. Always have plenty to do in the work of the Lord, for you know that your labor is not in vain in the Lord.
Philippians 4:1
Therefore, my beloved brothers I long to see you. You are my joy and crown. In this way stand firm in the Lord, my beloved.
2 Thessalonians 3:14
If anyone does not obey our word in this letter, take special note of that person and do not associate with him, so that he will be put to shame.
Jude 1:3
Beloved, I diligently wrote you about our common salvation. I found it necessary to write to you exhorting you to contend earnestly for the faith which was once for all delivered to the holy ones.