Matthew 6:16-18

“Moreover, when you fast, do not be like the hypocrites with a sad countenance. For they disfigure their faces so they may appear to men to be fasting. Truly I say to you, they have their reward. But you, when you fast, anoint your head and wash your face, so that you will not appear to men to be fasting, but to your Father who is in secret. And your Father who sees in secret will reward you openly.