2 Thessalonians 2:15

So then, brethren, stand your ground, and hold fast to the teachings which you have received from us, whether by word of mouth or by letter.

1 Corinthians 11:2

Now I commend you for remembering me in everything, and because you hold fast truths and practices precisely as I have taught them to you.

1 Corinthians 16:13

Be on the alert; stand firm in the faith; acquit yourselves like men; be strong.

2 Thessalonians 2:2

not readily to become unsettled in mind or troubled--either by any pretended spiritual revelation or by any message or letter claiming to have been sent by us--through fancying that the day of the Lord is now here.

2 Thessalonians 3:6

But, by the authority of the Lord, we command you, brethren, to stand aloof from every brother whose life is disorderly and not in accordance with the teaching which all received from us.

Romans 16:17

But I beseech you, brethren, to keep a watch on those who are causing the divisions among you, and are leading others into sin, in defiance of the instruction which you have received; and habitually to shun them.

1 Corinthians 15:58

Therefore, my dear brethren, be firm, unmovable, busily occupied at all times in the Lord's work, knowing that your toil is not fruitless in the Lord.

Philippians 4:1

Therefore, my brethren, dearly loved and longed for, my joy and crown, so stand firm in the Lord, my dearly-loved ones.

2 Thessalonians 3:14

and if any one refuses to obey these our written instructions, mark that man and hold no communication with him--so that he may be made to feel ashamed.

Jude 1:3

Dear friends, since I am eager to begin a letter to you on the subject of our common salvation, I find myself constrained to write and cheer you on to the vigorous defense of the faith delivered once for all to God's people.

Treasury of Scripture Knowledge

Summary

Therefore, brethren, stand fast, and hold the traditions which ye have been taught, whether by word, or our epistle.

Bible References

Whether

2 Thessalonians 2:2
not readily to become unsettled in mind or troubled--either by any pretended spiritual revelation or by any message or letter claiming to have been sent by us--through fancying that the day of the Lord is now here.
2 Thessalonians 3:14
and if any one refuses to obey these our written instructions, mark that man and hold no communication with him--so that he may be made to feel ashamed.