Joel 2:1

1 Thessalonians 5:2

For you yourselves know perfectly well that the day of the Lord comes like a thief in the night.

James 5:8

So you also must be patient: keeping up your courage; for the Coming of the Lord is now close at hand.

1 Peter 4:7

But the end of all things is now close at hand: therefore be sober-minded and temperate, so that you may give yourselves to prayer.

Therefore, my dearly-loved friends, as I have always found you obedient, labour earnestly with fear and trembling--not merely as though I were present with you, but much more now since I am absent from you--labour earnestly, I say, to make sure of your own salvation.

Treasury of Scripture Knowledge

Summary

Joel 2:1

Blow ye the trumpet in Zion, and sound an alarm in my holy mountain: let all the inhabitants of the land tremble: for the day of the LORD cometh, for it is nigh at hand;