'Day of the Lord' in the Bible

the sun will be turned into darkness and the moon into blood, before the day of the Lord cometh, the great and notable day.

to deliver such a man over to Satan for the destruction of his flesh, that his spirit may be saved in the day of the Lord.

as also ye have acknowledged us in part, that we are your glorying, as ye also are ours in the day of the Lord Jesus.

for ye yourselves know full well, that the day of the Lord so cometh as a thief in the night.

that ye be not easily shaken in mind, nor troubled, either by spirit, or by word, or by letter as from us, as if the day of the Lord were close at hand.

But the day of the Lord will come as a thief; in which the heavens will pass away with a great noise, and the elements will melt with fervent heat, and the earth and the works that are therein will be burned up.