Luke 12:5

But I am warning you about whom you should fear. Fear the One [i.e., God] who, after He has killed [i.e., the body], has power to throw [you] into hell [See note on Matt. 5:29]. Yes, I tell you, fear Him.

Matthew 10:28

And do not be afraid of those who can kill your body but not your soul. Instead, fear Him [i.e., God] who is able to destroy both your soul and body in hell. [See note on 5:29].

2 Peter 2:4

For if God did not spare sinning angels, but cast them in chains, into deep, dark dungeons to await judgment;

Matthew 5:22

But I say to you that every person who is angry toward his brother will be subject to judgment; and whoever calls his brother 'stupid idiot' is subject to [being sentenced by] the [Jewish] Council, and whoever says, 'go to hell' is subject to going to the fire of hell [himself].

Matthew 25:41

Then He [i.e., the King] will say to those at His left side, 'Go away from me, you who are cursed [by God], into the never ending fire which is prepared for the devil and his angels.

Matthew 25:46

And these [i.e., the ones at His left side] will go away to never ending punishment, but those who did what was right will go to never ending life."

Mark 13:23

But pay attention, for I have told you [all this] ahead of time.

1 Thessalonians 4:6

And none of you should violate and exploit his brother [or sister] in such a matter. For the Lord will punish people for all these things, just as we told you before and warned you.

Hebrews 10:31

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

Revelation 14:7

And he said [to them] in a loud voice, "Fear God and honor Him, for the time has come for Him to judge people. Worship Him who made the heaven, the earth, the ocean and the springs of water."

Revelation 15:4

O Lord, who will not fear [you] and honor your name, for only you are holy? [So], all the nations will come and worship in front of you, for your righteous deeds have been revealed."

Revelation 20:14

Then death and the unseen place of departed spirits were thrown into the lake of fire [i.e., after their spirits were reunited with some kind of a body]. This lake of fire 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 pay attention, for I have told you [all this] ahead of time.
1 Thessalonians 4:6
And none of you should violate and exploit his brother [or sister] in such a matter. For the Lord will punish people for all these things, just as we told you before and warned you.

Power

Matthew 10:28
And do not be afraid of those who can kill your body but not your soul. Instead, fear Him [i.e., God] who is able to destroy both your soul and body in hell. [See note on 5:29].
Matthew 25:41
Then He [i.e., the King] will say to those at His left side, 'Go away from me, you who are cursed [by God], into the never ending fire which is prepared for the devil and his angels.
2 Peter 2:4
For if God did not spare sinning angels, but cast them in chains, into deep, dark dungeons to await judgment;
Revelation 20:14
Then death and the unseen place of departed spirits were thrown into the lake of fire [i.e., after their spirits were reunited with some kind of a body]. This lake of fire is the second death.