Surah Al-An'am 6:156

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

[We revealed it] lest you say, "The Scripture was only sent down to two groups before us, but we were of their study unaware,"

Translation: Saheeh International

Tafsir

We have revealed it lest you should say ‘The Scripture was revealed only upon two parties — the Jews and the Christians — before us and we in has been softened its noun omitted in other words read as innā indeed have been unacquainted with their study’ their reading of the scripture not knowing any of it since it is …

Excerpt from Tafsir al-Jalalayn, commentary on 6:156, via Quran.com. The reader has the full commentary and 9 more tafsirs.