ירמיהו ג:כג מדרש: ספרא

4) R. Yehudah says: It is written (Jeremiah 3:23) "And you have polluted the land with your harlotries and with your wickedness. Therefore, the showers have been withheld, and there has been no latter rain; and you had a harlot's forehead; you refused to be ashamed."