Matthew 6:4, 6, 18

Give your gifts in private, and your Father, who sees everything, will reward you.

But when you pray, go away by yourself, shut the door behind you, and pray to your Father in private. Then your Father, who sees everything, will reward you.

Then no one will notice that you are fasting, except your Father, who knows what you do in private. And your Father, who sees everything, will reward you.