سورة Al-An'am ( The Cattle ) - الآية 148

The polytheists will say, “Had God willed, we would not have practiced idolatry, nor would have our forefathers, nor would we have prohibited anything.” Likewise those before them lied, until they tasted Our might. Say, “Do you have any knowledge that you can produce for us? You follow nothing but conjecture, and you only guess.”