Philippians 3:2

Watch out for the "dogs!" [Note: "Dogs" were viewed with disgust by the ancient Jews (Deut. 23:18; II Kings 8:13; Rev. 22:15), so the term is used here derogatorily for Jewish Christians who were trying to impose on the church the requirements of the law of Moses]. Watch out for the evil workers! Watch out for those who mutilate the body meaninglessly! [Note: Paul here alludes, in a derogatory wordplay, to the Jewish practice of circumcision].

2 Peter 3:7

But, by means of the same word [of God], the present heavens and earth have been reserved for fire, awaiting the judgment and destruction [by God], along with [its] ungodly people.

Revelation 16:14-16

For they are spirits of demons, which perform [supernatural] signs. These spirits go out to the kings of the whole world to assemble them for battle on the great day of Almighty God.

Revelation 19:19-21

Then I saw the beast [See 13:1ff], and the kings of the earth and their armies assembled together to wage war against the One who was riding on the horse [i.e., Christ. See verse 11] and His army.

Treasury of Scripture Knowledge

Summary

Multitudes, multitudes in the valley of decision: for the day of the LORD is near in the valley of decision.

Bible References

Multitudes

Revelation 16:14
For they are spirits of demons, which perform [supernatural] signs. These spirits go out to the kings of the whole world to assemble them for battle on the great day of Almighty God.
Revelation 19:19
Then I saw the beast [See 13:1ff], and the kings of the earth and their armies assembled together to wage war against the One who was riding on the horse [i.e., Christ. See verse 11] and His army.

For

2 Peter 3:7
But, by means of the same word [of God], the present heavens and earth have been reserved for fire, awaiting the judgment and destruction [by God], along with [its] ungodly people.