Luke 12:5

But I will shew you whom ye should fear,---Fear Him, who after He hath killed, hath power to cast into hell; yea, I say unto you, fear Him.

Matthew 10:28

And be not afraid of them, who can only kill the body, but are not able to kill the soul: but rather fear Him, who is able to destroy both soul and body in hell.

2 Peter 2:4

For if God spared not the angels that sinned, but cast them down to hell, and delivered them into chains of darkness, to be reserved unto judgement; and if He spared not the old world,

Matthew 5:22

but I say unto you, that whosoever is angry with his brother without cause shall be liable to the judgment; and whosoever shall say to his brother, Raca, shall be obnoxious to the council; but whosoever shall say, "Thou fool," shall be in danger of hell-fire.

Matthew 25:41

Then will He say also to those on the left hand, Depart from me, ye cursed, into everlasting fire, prepared for the devil and his angels:

Matthew 25:46

And these shall go away into everlasting punishment: but the righteous into life everlasting.

Mark 13:23

But do ye beware: behold, I have told you all before.

1 Thessalonians 4:6

That no one over-reach, or wrong his brother in any thing: because the Lord is an avenger of all such crimes, as we also told you before, and testified to you.

Hebrews 10:31

It is a dreadful thing to fall into the hands of the living God.

Revelation 14:7

and people, saying with a loud voice, Fear God, and give glory to Him; for the time of his judgement is come: and worship Him that made the heaven, and the earth, and the sea, and the fountains of waters.

Revelation 15:4

O Lord, and glorify thy name? for thou only art holy: and all the nations shall come and worship before thee; for thy righteous judgements are made manifest."

Revelation 20:14

And death and Hades were cast into the lake of fire: this is the second death.

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
But do ye beware: behold, I have told you all before.
1 Thessalonians 4:6
That no one over-reach, or wrong his brother in any thing: because the Lord is an avenger of all such crimes, as we also told you before, and testified to you.

Power

Matthew 10:28
And be not afraid of them, who can only kill the body, but are not able to kill the soul: but rather fear Him, who is able to destroy both soul and body in hell.
Matthew 25:41
Then will He say also to those on the left hand, Depart from me, ye cursed, into everlasting fire, prepared for the devil and his angels:
2 Peter 2:4
For if God spared not the angels that sinned, but cast them down to hell, and delivered them into chains of darkness, to be reserved unto judgement; and if He spared not the old world,
Revelation 20:14
And death and Hades were cast into the lake of fire: this is the second death.