Matthew 6:16-18

Fasting

16 "When you go without eating, do not look gloomy like those who only pretend to be holy. They make their faces very sad. They want to show people they are fasting. What I'm about to tell you is true. They have received their complete reward.

17 "But when you go without eating, put olive oil on your head. Wash your face.

18 Then others will not know that you are fasting. Only your Father, who can't be seen, will know it. He will reward you. Your Father sees what is done secretly.