'Day and Night' in the Bible

And shall not God execute vengeance for his own elect, who cry out to him day and night, though he bear long with them?

but their design was discovered to Saul. And they kept guard at the gates of the city day and night, that they might kill him.

And the four living beings had each for himself six wings encircling him, and within they were full of eyes; and they never cease day and night, saying, Holy, holy, holy, Lord God Almighty, who was, and who is, and who is coming.

Therefore are they before the throne of God, and serve him day and night in his temple: and he that sitteth on the throne shall dwell among them.

And I heard a great voice saying in the heaven, Now is come the salvation, and the power, and the kingdom of our God, and the authority of his Christ; because the accuser of our brethren is cast down, who accused them before our God day and night.

And the devil who deceived them was cast into the lake of fire and brimstone, where the beast and the false prophet are, and they shall be tormented day and night for ever and ever.