[We revealed it] lest you say, "The Scripture was only sent down to two groups before us, but we were of their study unaware,"
The Saheeh International Quran Translation
أَن تَقُولُوٓا۟ إِنَّمَآ أُنزِلَ ٱلْكِتَٰبُ عَلَىٰ طَآئِفَتَيْنِ مِن قَبْلِنَا وَإِن كُنَّا عَن دِرَاسَتِهِمْ لَغَٰفِلِينَ[We revealed it] lest you say, "The Scripture was only sent down to two groups before us, but we were of their study unaware,"