Bible Verses About Fasting: Not to be made a subject of display

"Now when you fast, don't go around looking miserable, like the hypocrites. They make sour faces so that people will know they are fasting. Yes! I tell you, they have their reward already!

But you, when you fast, wash your face and groom yourself,

so that no one will know you are fasting -- except your Father, who is with you in secret. Your Father, who sees what is done in secret, will reward you.