'Day of the Lord' in the Bible

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

waiting for the revelation of our Lord Jesus Christ, Who will also confirm you to the end, that ye may be blameless in the day of the Lord Jesus Christ.

with the power of our Lord Jesus Christ, To deliver such an one 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 rejoicing, as ye also are ours, in the day of the Lord Jesus.

For ye yourselves know perfectly, that the day of the Lord so cometh as a thief in the night.

and our gathering together unto him, That ye be not soon shaken in mind or terrified, neither by spirit, nor by word, nor by letter, as from us, as if the day of the Lord were at hand.

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