This is the 16th most frequent Urdu word.
کہا
"کہا" means "said" in English.
In this sentence, 'کہا' is used as the main verb meaning 'said', indicating the act of speaking or stating something.
انہوں نے کہا کہ وہ مطالعہ کریں گے۔
They said that they would study.
Here, 'کہا' again means 'said', but is used in a reported speech structure to refer to something spoken earlier.
اس نے پوچھا کہ انہوں نے کیا کہا؟
He asked what they said.
In this case, 'کہا' appears in a passive construction, meaning 'told', to indicate an action directed towards the subject.