Verse 156

أَن تَقُولُوٓا۟ إِنَّمَآ أُنزِلَ ٱلْكِتَـٰبُ عَلَىٰ طَآئِفَتَيْنِ مِن قَبْلِنَا وَإِن كُنَّا عَن دِرَاسَتِهِمْ لَغَـٰفِلِينَ

Lest they may say that a scripture was revealed to the two other groups before us, and we were indeed unaware of their teachings.