Surah Yusuf 12:3

نَحْنُ نَقُصُّ عَلَيْكَ أَحْسَنَ ٱلْقَصَصِ بِمَآ أَوْحَيْنَآ إِلَيْكَ هَـٰذَا ٱلْقُرْءَانَ وَإِن كُنتَ مِن قَبْلِهِۦ لَمِنَ ٱلْغَـٰفِلِينَ

We relate to you, [O Muḥammad], the best of stories in what We have revealed to you of this Qur’ān although you were, before it, among the unaware.

Translation: Saheeh International

Tafsir

We will relate to you the best of narratives in what We have revealed in Our revealing to you this Qur’ān though wa-in in is softened in other words understand it as wa-innahu prior to it you were of the heedless.

Excerpt from Tafsir al-Jalalayn, commentary on 12:3, via Quran.com. The reader has the full commentary and 9 more tafsirs.