1 Then Jesus was led by the Spirit into the wilderness to be tempted there by the devil. 2 For forty days and forty nights he fasted and became very hungry. 3 During that time the devil came and said to him, “If you are the Son of God, tell these stones to become loaves of bread.” 4 But Jesus told him, “No! The Scriptures say, ‘People do not live by bread alone, but by every word that comes from the mouth of God.’”
16 “When you fast, do not look somber as the hypocrites do, for they disfigure their faces to show others they are fasting. Truly I tell you, they have received their reward in full. 17 But when you fast, put oil on your head and wash your face, 18 so that it will not be obvious to others that you are fasting, but only to your Father, who is unseen; and your Father, who sees what is done in secret, will reward you.”
and then