On saying ‘Ramadhan’ without the ‘month’ prefix

Question: I read in a book that it has been narrated from the Commander of the Faithful Imam ‘Ali (peace be upon him) that: “Don’t say Ramadhan because, you don’t know what Ramadhan is. Whoever says so must pay charity and must offer an atonement fast.” Is this correct? Answer: The holy month of Ramadhan