들었다는

In a sentence

• 그곳에서는 이상한 소문을 들었다는 이야기가 많습니다.

  There are many stories claiming that strange rumors have been heard there.

  '들었다는' is used to refer to something heard or received as information, making it declarative.

• 나는 그가 어디로 갔다고 들었다는 말을 했어요.

  I said I heard him tell where he went.

  '들었다는' communicates what was heard indirectly from someone's statement about an event.

• 들었다는 말을 믿으면 안 된다고 생각해요.

  I think you shouldn't believe in what you heard said.

  '들었다는' is used to express skepticism about heard information.