Matthew 6:4, 6, 18

so that your charitable acts will be done in secret; and your Father who sees [what is done] in secret will reward you.

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.

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.