2 Timothy 3:14
14 But as for you, zcontinue in what you have learned and have firmly believed, knowing from whom1 you learned it
Titus 1:9
9 He must whold firm to the trustworthy word as taught, so that he may be able to give instruction in xsound1 doctrine and also to rebuke those who contradict it.
Revelation 3:3
3 mRemember, then, what you received and heard. Keep it, and repent. If you will not wake up, nI will come olike a thief, and you will not know at what hour I will come against you.