'Day and Night' in the Bible

For this reason they stand before the very throne of God, and render Him service, day after day and night after night, in His sanctuary, and He who is sitting upon the throne will shelter them in His tent.

Then I heard a loud voice speaking in Heaven. It said, "The salvation and the power and the Kingdom of our God have now come, and the sovereignty of His Christ; for the accuser of our brethren has been hurled down--he who, day after day and night after night, was wont to accuse them in the presence of God.

and the Devil, who had been leading them astray, was thrown into the Lake of fire and sulphur where the Wild Beast and the false Prophet were, and day and night they will suffer torture until the Ages of the Ages.