Matthew 6:6-7, 16-18

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 when you pray, do not use meaningless repetition as the Gentiles do, for they think they will be heard because of their many words. [1 Kin 18:25-29]

“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] But when you fast, put oil on your head [as you normally would to groom your hair] and wash your face so that your fasting will not be noticed by people, but by your Father who is in secret; and your Father who sees [what is done]in secret will reward you.