Daniel 9:3

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

(d) He does not speak of that ordinary prayer, which he used in his house three times a day, but of a rare and vehement prayer, lest their sins should cause God to delay the time of their deliverance prophesied by Jeremiah.