Jeremiah 30:7

[In that day] the sun will become dark and the moon will [appear] as blood. [This will all happen] before the great and wonderful day when the Lord comes. [Note: Some view these last two verses as a reference to events occurring at the end of time. See Matt. 24:29-30].

For the terrible day of their anger has come, and who will be able to survive it?"

There will be great trouble [during these times], such as had never been from the beginning of time up to the present, or ever will be [in the days to come].

There will be great trouble during those days, such as had never been from the beginning of God's creation until the present, or even will be [in the days to come].

And so [i.e., in this way] all the Israelites will be saved. [Note: The "all" here is thought by many to refer to a large number of the physical Jews who will be saved, not necessarily to every single individual Jew]. Even as it is written [Isa. 59:20-21], "The Deliverer [i.e., Christ] will come from Zion [i.e., the city of Jerusalem, or from the nation of Israel]. He will take away the wickedness from Jacob [i.e., the Jews]."