And they meant to stir the hearts of God’s people to follow His Ways. Paul and others aimed to remind believers about The Lord’s coming and His complete victory over the enemy.

In the New Testament, the phrase relates to the 2nd coming of Jesus. Will not the day of the Lord be darkness, not light-pitch-dark, without a ray of brightness?'' ( Amos 5:18-20). “Woe to you who long for the day of the Lord! Why do you long for the day of the Lord? That day will be darkness, not light.It will be as though a man fled from a lion only to meet a bear, as though he entered his house and rested his hand on the wall only to have a snake bite him. Like dawn spreading across the mountains a large and mighty army comes, such as never was in ancient times nor ever will be in ages to come'' ( Joel 2:1-2). It is close at hand-a day of darkness and gloom, a day of clouds and blackness. Let all who live in the land tremble, for the day of the Lord is coming. ''Blow the trumpet in Zion sound the alarm on my holy hill. Their tidings included images of the invasion and devastation of Jerusalem, as well as visions of the future. They spoke in part about events, namely wars, that would be coming relatively soon. Some of the Old Testament prophets delivered messages about the idea. But some scholars think it applies to one particular day.

Scripture appears to use the term to designate a period of time associated with what’s called The End Times. This phrase refers to when God’s plan for the Earth will be fulfilled, and His reign will begin.

Coming like a thief in the night song