'Day of the Lord' in the Bible

Alas for the day! for the day of the LORD is at hand, and as a destruction from the Almighty shall it come.

Blow 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 comes, for it is near at hand;

And the LORD shall utter his voice before his army: for his camp is very great: for he is strong that executes his word: for the day of the LORD is great and very terrible; and who can endure it?

The sun shall be turned into darkness, and the moon into blood, before the great and the terrible day of the LORD comes.

Multitudes, multitudes in the valley of decision: for the day of the LORD is near in the valley of decision.