'Day of the Lord' in the Bible

The sun shall be turned into darkness, and the moon into blood, before the great and illustrious day of the Lord come.

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

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

for yourselves know precisely that the day of the Lord so cometh as a thief in the night.

that ye be not hastily agitated with apprehension, nor troubled, neither by spirit, nor by discourse, nor by letter, as coming from us, as though the day of the Lord was instantly approaching.

But the day of the Lord will come as a thief by night; in which the heavens shall pass away with a rushing noise, and the first principles of matter in flames dissolve, and the earth and all the works upon it be burnt up.