Ephesians 6:13-14
Therefore put on the complete armour of God, so that you may be able to stand your ground on the day of battle, and, having fought to the end, to remain victors on the field.
1 Thessalonians 5:2
For you yourselves know perfectly well that the day of the Lord comes like a thief in the night.
2 Peter 3:10
The day of the Lord will come like a thief--it will be a day on which the heavens will pass away with a rushing noise, the elements be destroyed in the fierce heat, and the earth and all the works of man be utterly burnt up.
Revelation 6:17
for the day of His anger--that great day--has come, and who is able to stand?"
Revelation 16:14
For they are the spirits of demons working marvels--spirits that go out to control the kings of the whole earth, to assemble them for the battle which is to take place on the great day of God, the Ruler of all.
Revelation 20:8-9
and will go out to lead astray the nations in all the four corners of the earth, Gog and Magog, and assemble them for war, and they are like the sands on the seashore in number.