Matthew 6:16-18

“And when you fast, don’t put on a sad face like the hypocrites. They distort their faces so people will know they are fasting. I assure you that they have their reward. When you fast, brush your hair and wash your face. Then you won’t look like you are fasting to people, but only to your Father who is present in that secret place. Your Father who sees in secret will reward you.