Bible Verses About Private Prayer: Day and night

And I set my face unto the Lord God, to seek by prayer and supplications, with fasting, and sackcloth, and ashes:

His prayer also, and how God was intreated of him, and all his sin, and his trespass, and the places wherein he built high places, and set up groves and graven images, before he was humbled: behold, they are written among the sayings of the seers.

And she was a widow of about fourscore and four years, which departed not from the temple, but served God with fastings and prayers night and day.

Thou shalt make thy prayer unto him, and he shall hear thee, and thou shalt pay thy vows.

Now therefore, O our God, hear the prayer of thy servant, and his supplications, and cause thy face to shine upon thy sanctuary that is desolate, for the Lord's sake.