Luke 12:5

But I will show you whom to fear. Fear Him who, after killing you, has power to hurl you down to the pit; yes, I tell you, fear Him.

Matthew 10:28

You must never be afraid of those who kill the body, but cannot kill the soul. But rather you must keep on fearing Him who can destroy both soul and body in the pit.

2 Peter 2:4

For if God did not spare angels when they sinned, but hurled them down to Tartarus and committed them to dark dungeons to await their doom,

Matthew 5:22

But I say to you: "Everyone who harbors malice against his brother, will have to answer to the court, and whoever speaks contemptuously to his brother, will have to answer to the supreme court; and whoever says to his brother, 'You cursed fool? will have to pay the penalty in the pit of torture.

Matthew 25:41

"Then He will say to those at His left, 'Be gone from me, you who are now cursed, to the everlasting fire prepared for the devil and his angels.

Matthew 25:46

Then these will go away to everlasting punishment, but the upright to everlasting life."

Mark 13:23

So you must be on your guard. I have warned you about it all beforehand.

1 Thessalonians 4:6

that no one should do wrong and defraud his brother in this matter, because the Lord takes vengeance for all such things, as we told you before and solemnly warned you.

Hebrews 10:31

It is a terrifying thing to fall into the hands of the ever living God!

Revelation 14:7

He cried in a loud voice, "Fear God and give Him glory, because the hour of His judgment has come. Worship Him who made heaven and earth and sea and the springs of water."

Revelation 15:4

Who will not fear and glorify your name, O Lord? For you alone are holy. All the nations will come and worship you, because the justice of your sentences has now been shown."

Revelation 20:14

Then death and the underworld were hurled into the fiery lake, This is the second death -- the fiery lake.

Treasury of Scripture Knowledge

Summary

But I will forewarn you whom ye shall fear: Fear him, which after he hath killed hath power to cast into hell; yea, I say unto you, Fear him.

Bible References

Forewarn

Mark 13:23
So you must be on your guard. I have warned you about it all beforehand.
1 Thessalonians 4:6
that no one should do wrong and defraud his brother in this matter, because the Lord takes vengeance for all such things, as we told you before and solemnly warned you.

Power

Matthew 10:28
You must never be afraid of those who kill the body, but cannot kill the soul. But rather you must keep on fearing Him who can destroy both soul and body in the pit.
Matthew 25:41
"Then He will say to those at His left, 'Be gone from me, you who are now cursed, to the everlasting fire prepared for the devil and his angels.
2 Peter 2:4
For if God did not spare angels when they sinned, but hurled them down to Tartarus and committed them to dark dungeons to await their doom,
Revelation 20:14
Then death and the underworld were hurled into the fiery lake, This is the second death -- the fiery lake.