Luke 12:5

But I will warn you whom you should fear. Fear him, who after he has killed, has power to cast into Gehenna. Yes, I tell you, fear him.

Psalm 9:17

The wicked shall be turned back to Sheol, even all the nations that forget God.

Matthew 10:28

Don't be afraid of those who kill the body, but are not able to kill the soul. Rather, fear him who is able to destroy both soul and body in Gehenna.

2 Peter 2:4

For if God didn't spare angels when they sinned, but cast them down to Tartarus, and committed them to pits of darkness, to be reserved for judgment;

Proverbs 14:26

In the fear of Yahweh is a secure fortress, and he will be a refuge for his children.

Jeremiah 5:22

Don't you fear me?' says Yahweh 'Won't you tremble at my presence, who have placed the sand for the bound of the sea, by a perpetual decree, that it can't pass it? and though its waves toss themselves, yet they can't prevail; though they roar, yet they can't pass over it.'

Jeremiah 10:7

Who should not fear you, King of the nations? For it appertains to you; because among all the wise men of the nations, and in all their royal estate, there is none like you.

Matthew 5:22

But I tell you, that everyone who is angry with his brother without a cause shall be in danger of the judgment; and whoever shall say to his brother, 'Raca!' shall be in danger of the council; and whoever shall say, 'You fool!' shall be in danger of the fire of Gehenna.

Matthew 25:41

Then he will say also to those on the left hand, 'Depart from me, you cursed, into the eternal fire which is prepared for the devil and his angels;

Matthew 25:46

These will go away into eternal punishment, but the righteous into eternal life."

Mark 13:23

But you watch. "Behold, I have told you all things beforehand.

1 Thessalonians 4:6

that no one should take advantage of and wrong a brother or sister in this matter; because the Lord is an avenger in all these things, as also we forewarned you and testified.

Hebrews 10:31

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

Revelation 14:7

He said with a loud voice, "Fear the Lord, and give him glory; for the hour of his judgment has come. Worship him who made the heaven, the earth, the sea, and the springs of waters!"

Revelation 15:4

Who wouldn't fear you, Lord, and glorify your name? For you only are holy. For all the nations will come and worship before you. For your righteous acts have been revealed."

Revelation 20:14

Death and Hades were thrown into the lake of fire. This is the second death, 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.

General references

Bible References

Forewarn

Mark 13:23
But you watch. "Behold, I have told you all things beforehand.
1 Thessalonians 4:6
that no one should take advantage of and wrong a brother or sister in this matter; because the Lord is an avenger in all these things, as also we forewarned you and testified.

Power

Psalm 9:17
The wicked shall be turned back to Sheol, even all the nations that forget God.
Matthew 10:28
Don't be afraid of those who kill the body, but are not able to kill the soul. Rather, fear him who is able to destroy both soul and body in Gehenna.
Matthew 25:41
Then he will say also to those on the left hand, 'Depart from me, you cursed, into the eternal fire which is prepared for the devil and his angels;
2 Peter 2:4
For if God didn't spare angels when they sinned, but cast them down to Tartarus, and committed them to pits of darkness, to be reserved for judgment;
Revelation 20:14
Death and Hades were thrown into the lake of fire. This is the second death, the lake of fire.

General references

Psalm 89:7
a very awesome God in the council of the holy ones, to be feared above all those who are around him?
Psalm 90:11
Who knows the power of your anger, your wrath according to the fear that is due to you?