2 Thessalonians 2:15

So then, brothers, stand firm [in the faith], and hold onto the [inspired] traditions which you were taught, whether by word [of mouth] or by a letter from us.

1 Corinthians 11:2

Now I commend you for remembering me in everything and for remaining loyal to the [inspired] traditions which I have handed on to you.

1 Corinthians 16:13

You people should be alert; stand firm in the faith; act like [godly] men; be [spiritually] strong.

2 Thessalonians 2:2

we request that you people do not become shaken up in your mind, nor alarmed, either by a spirit [i.e., by some prophetic prediction], or by a report, or by a letter supposedly from us, that the day of the Lord [i.e., when Jesus returns] has already come.

2 Thessalonians 3:6

Now we command you, brothers, in the name [i.e., by the authority] of our Lord Jesus Christ, that you people stay away from every brother [or sister] who lives an idle life [See note on I Thess. 5:14], and not according to the [inspired] tradition which you received from us.

Romans 16:17

Now I urge you, brothers, watch out for those who are causing divisions and occasions for falling [away from God over matters] contrary to the teaching you have learned, and withdraw from them [i.e., stop listening to their false teaching].

1 Corinthians 15:58

Therefore, my dearly loved brothers, stand firm [in the faith]; do not be moved [from your commitment]. Always do your best to work for the Lord, since you know that your labor in the Lord's [service] is not for nothing.

Philippians 4:1

So, my dearly loved brothers, those whom I long to see, [who are] my [reason for] being glad and [who are] my crown of victory; stand firm in [your devotion to] the Lord, my dear ones.

2 Thessalonians 3:14

And if any person does not obey our instructions, [given] in this letter, you should take note of him so that you do not associate with him, in hope that he will become ashamed [of his conduct].

Jude 1:3

Dearly loved ones, as I was very eagerly planning to write to you about the salvation we share in common, I felt it necessary [instead] to write urging you to contend earnestly for the faith [i.e., the teaching of Christ] which was once and for all delivered [by the apostles, See verse 17] to the saints [i.e., God's holy 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
we request that you people do not become shaken up in your mind, nor alarmed, either by a spirit [i.e., by some prophetic prediction], or by a report, or by a letter supposedly from us, that the day of the Lord [i.e., when Jesus returns] has already come.
2 Thessalonians 3:14
And if any person does not obey our instructions, [given] in this letter, you should take note of him so that you do not associate with him, in hope that he will become ashamed [of his conduct].