Matthew 6:6, 16

But when you pray, go into your most private room, close the door and pray to your Father who is in secret, and your Father who sees [what is done] in secret will reward you.

“And whenever you are fasting, do not look gloomy like the hypocrites, for they put on a sad and dismal face [like actors, discoloring their faces with ashes or dirt] so that their fasting may be seen by men. I assure you and most solemnly say to you, they [already]have their reward in full. [Is 58:5]