Luke 12:5

I will show you whom to fear ??fear Him who after he has killed has power to cast you into Gehenna. Yes, I tell you, fear Him.

Matthew 10:28

Have no fear of those who kill the body but cannot kill the soul: rather fear Him who can destroy both soul and body in Gehenna.

2 Peter 2:4

For if God did not spare angels who had sinned, but committing them to pits of the nether gloom in Tartarus, reserved them under punishment for doom:

Matthew 5:22

whoever maligns his brother must come before the San hedrin, whoever curses his brother must go to the fire of Gehenna.' But I tell you, whoever is angry with his brother [without cause] will be sentenced by God.

Matthew 25:41

Then he will say to those on the left, 'Begone from me, you accursed ones, to the eternal fire which has been prepared for the devil and his angels!

Matthew 25:46

So they shall depart to eternal punishment, and the just to eternal life."

Mark 13:23

Now take care! I am telling you of it all beforehand.

Hebrews 10:31

It is an awful thing to fall into the hands of the living God.

Revelation 14:7

he cried aloud, "Fear God and give him glory, for the hour of his judgment has come; worship him who made heaven and earth, the sea and the fountains of water."

Revelation 15:4

Who shall not fear, O Lord, and glorify thy name? for thou alone art holy. Yea, all nations shall come and worship before thee, for thy judgments are disclosed."

Revelation 20:14

Then Death and Hades were flung into the lake of fire,

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.

Forewarn

Bible References

Forewarn

Mark 13:23
Now take care! I am telling you of it all beforehand.

Power

Matthew 10:28
Have no fear of those who kill the body but cannot kill the soul: rather fear Him who can destroy both soul and body in Gehenna.
Matthew 25:41
Then he will say to those on the left, 'Begone from me, you accursed ones, to the eternal fire which has been prepared for the devil and his angels!
2 Peter 2:4
For if God did not spare angels who had sinned, but committing them to pits of the nether gloom in Tartarus, reserved them under punishment for doom:
Revelation 20:14
Then Death and Hades were flung into the lake of fire,