a little bird told me

a little bird told me
said if you know who gave you the information being discussed but will not say that it was; I was told by a private or secret source
زمانی به کار می رود که گوینده قصد مخفی نگه داشتن هویت منبع اطلاعاتی خود را دارد.
Example: Let’s just say I know because a little bird told me