'Day After Day' in the Bible

And each of the four living creatures had six wings, and in every direction, and within, are full of eyes; and day after day, and night after night, they never cease saying, "Holy, holy, holy, Lord God, the Ruler of all, who wast and art and evermore shalt be."

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.