Biblical fasting is simply refraining or abstaining from food for a set period of time in order to achieve our purpose in prayers.  Fasting is ordained by God to loose the bands of wickedness. Isaiah 58:6 90 Spiritual Warfare Scriptures KJV Why Do We Fast?. NOTE: Kindly Read My Dream Interpretation Book And Other Inspiring Books… Benefits /Importance of Fasting By fasting and praying, we feed our inner man. Biblical fasting strengthens our spirit and reduces the works of the flesh.