John 8:31
Jesus therefore said to those of the Jews who had now believed in Him, "As for you, if you hold fast to my teaching, then you are truly my disciples;
John 15:6-7
If any one does not continue in me, he is like the unfruitful branch which is at once thrown away and then withers up. Such branches they gather up and throw into the fire and they are burned.
Hebrews 2:1-3
For this reason we ought to pay the more earnest heed to the things which we have heard, for fear we should drift away from them.
1 John 2:24
As for you, let the teaching which you have received from the very beginning continue in your hearts. If that teaching does continue in your hearts, you also will continue to be in union with the Son and with the Father.
1 John 2:27
And as for you, the anointing which you received from Him remains within you, and there is no need for any one to teach you. But since His anointing gives you instruction in all things--and is true and is no falsehood--you are continuing in union with Him even as it has taught you to do.