There are quite a few scary verses in the Bible.  Here are a few off the top of my head that I would think would have to be considered:

James 3:1
Let not many of you become teachers, my brethren, knowing that as such we will incur a stricter judgment.

Only scary for teachers I guess.

Matt7:23
“And then I will declare to them, ‘I never knew you; DEPART FROM ME, YOU WHO PRACTICE LAWLESSNESS.’

This is a verse about a group of people thinking they were Christians, who find out they were wrong, after it’s too late.

Matthew 6:15
“But if you do not forgive others, then your Father will not forgive your transgressions.

Hopefully either we all forgive everybody, or this verse doesn’t apply to us.

Luke 9:23-24
And He was saying to them all, “If anyone wishes to come after Me, he must deny himself, and take up his cross daily and follow Me.  “For whoever wishes to save his life will lose it, but whoever loses his life for My sake, he is the one who will save it.

Being crucified daily… losing our life… Do we really do this?  If not, then we cannot follow Christ.  Or maybe I’m misunderstanding again.  Sounds scary to me.

Rev 21:8
all liars—their place will be in the fiery lake of burning sulfur. This is the second death.

All liars?  Hopefully either I will not be a liar when that time comes, or again, this verse doesn’t apply to me.  Scary.

Lately I’ve been chatting with a friend of mine, and he mentioned this verse.  It’s pretty scary as well.

Revelation 3:16
‘So because you are lukewarm, and neither hot nor cold, I will spit you out of My mouth.

For a little context, read Rev 3:14-19.  Jesus is talking to the church of Laodicea.  Sadly, I believe the vast majority of Christians in America are lukewarm, including myself most of the time.  We go through our lives just trying to get to the next thing to do.  Nobody sees a passion for pursuing Christ in our lives.  I’m not sure why.  I think we have become so comfortable in America that we just don’t want to change our comfy lives.  Most churches are full of lukewarm Christians, and even worse, most church are ok with it.  As long as people keep showing up for church, putting on their Sunday face, and giving their money, that’s the main thing.  How do we combat that type of thinking?  I know I’ve been frustrated in the past (and now), and I’ve just come to the conclusion that there are no churches passionately pursuing Christ, or at least none that I’ve come into contact with.  So do I just give up on the idea, accept it, and try to make the best of it?

What’s the scariest verse in the Bible to you?