Revelation 2:16

2:16 Therefore, repent! If not, I will come against you quickly and make war against those people with the sword of my mouth.

Revelation 11:7

11:7 When they have completed their testimony, the beast that comes up from the abyss will make war on them and conquer them and kill them.

Revelation 12:7

War in Heaven

12:7 Then war broke out in heaven: Michael and his angels fought against the dragon, and the dragon and his angels fought back.

Revelation 13:7

13:7 The beast was permitted to go to war against the saints and conquer them. He was given ruling authority over every tribe, people, language, and nation,