I never fast ..... GOD’S Law given through Moses required fasting only on one occasion—on the annual Day of Atonement. The Law commanded that on that day the Israelites were to ‘afflict their souls,’ which is understood to mean that they fasted. (Leviticus 16:29-31; 23:27; Psalm 35:13) However, this fast was not a mere formalism. The observance of the Day of Atonement moved the people of Israel to greater consciousness of their sinfulness and the need for redemption.
However, with the death of Jesus Christ - we have been atoned of our sins and able to pray for repentance of our sins. The Mosaic Law ended when “the Christ was offered once for all time to bear the sins of many.” (Hebrews 9:24-28) And with the end of the Law, the command to fast on Atonement Day ended. Thus, the only obligatory fast mentioned in the Bible was removed.
A true fast that is pleasing to Yhwh is: To break unjust fetters, to undo the thongs of the yoke, to let the oppressed go free, to break all yokes. Sharing your food with the hungry, sheltering the homeless poor, if you see someone lacking clothes, clothe them, & not to turn away from your own kin.