Matthew 6:1; Matthew 6:16

1 "Beware of practicing your righteousness before other people in order to be seen by them, for then you will have no reward from your Father who is in heaven.

16 "And when you fast, do not look gloomy like the hypocrites, for they disfigure their faces that their fasting may be seen by others. Truly, I say to you, they have received their reward.