'Night and Day' in the Bible

And thy life shall hang in doubt before thee, and thou shall fear night and day, and shall have no assurance of thy life.

that thine eyes may be open toward this house night and day, even toward the place whereof thou have said, My name shall be there, to hearken to the prayer which thy servant shall pray toward this place.

I LORD am its keeper, I will water it every moment. Lest any hurt it, I will guard it night and day.

And thou shall say this word to them: Let my eyes run down with tears night and day, and let them not cease. For the virgin daughter of my people is broken with a great breach, with a very grievous wound.