أَن تَقُولُوا إِنَّمَا أُنزِلَ الْكِتَابُ عَلَىٰ طَائِفَتَيْنِ مِن قَبْلِنَا وَإِن كُنَّا عَن دِرَاسَتِهِمْ لَغَافِلِينَ (156)
(6:156) (You may no longer) say now that the Book was revealed only to two groups of people before Us *137and that we had indeed been unaware of what they read.
*137). The allusion is to the Jews and the Christians.