Mateus 6

17 Instead, each of you, when you abstain from food, should comb your hair and wash your face as usual, 18 in order that other people will not notice that you are fasting because you will look as you always do. But God, your Father, whom no one can see, will observe that you are abstaining from food. God your Father sees you even though no one else sees you, and he will reward you."