'Day of the Lord' in the Bible

Sorrow for the day! for the day of the Lord is near, and as destruction from the Ruler of all it will come.

Let the horn be sounded in Zion, and a war-cry in my holy mountain; let all the people of the land be troubled: for the day of the Lord is coming;

And the Lord is thundering before his forces; for very great is his army; for he is strong who gives effect to his word: for the day of the Lord is great and greatly to be feared, and who has strength against it?

The sun will be made dark and the moon turned to blood, before the great day of the Lord comes, a day to be feared.

Masses on masses in the valley of decision! for the day of the Lord is near in the valley of decision.