Matthew 6:4, 6, 18

that your charitable deed may be in secret; and your Father who sees in secret will Himself reward you openly.

But you, when you pray, go into your room, and when you have shut your door, pray to your Father who is in the secret place; and your Father who sees in secret will reward you openly.

so that you do not appear to men to be fasting, but to your Father who is in the secret place; and your Father who sees in secret will reward you openly.