1 John 2:19

They went away from us, but they were not of us. For, if they had been of us, they would have abode with us; but they went away, that they might be made manifest that they were not of us.

Jude 1:20-21

But you, beloved, building up yourselves on your most holy faith, praying with a holy spirit;

Revelation 2:5

Remember, therefore, from what you are fallen, and reform, and do the first works, otherwise I will come to you quickly, and take away your lamp out of its place, unless you reform.

Treasury of Scripture Knowledge

Summary

Behold therefore the goodness and severity of God: on them which fell, severity; but toward thee, goodness, if thou continue in his goodness: otherwise thou also shalt be cut off.

Otherwise

Bible References

If thou

1 John 2:19
They went away from us, but they were not of us. For, if they had been of us, they would have abode with us; but they went away, that they might be made manifest that they were not of us.
Jude 1:20
But you, beloved, building up yourselves on your most holy faith, praying with a holy spirit;

Otherwise

Revelation 2:5
Remember, therefore, from what you are fallen, and reform, and do the first works, otherwise I will come to you quickly, and take away your lamp out of its place, unless you reform.