Matthew 6:4

4 so that your giving may be in secret. Then your Father, who sees what is done in secret, will reward you.

Read Matthew 6:4 Using Other Translations

That thine alms may be in secret: and thy Father which seeth in secret himself shall reward thee openly.
so that your giving may be in secret. And your Father who sees in secret will reward you.
Give your gifts in private, and your Father, who sees everything, will reward you.