Surah Al-Waqi'ah 56:86

فَلَوْلَآ إِن كُنتُمْ غَيْرَ مَدِينِينَ

Then why do you not, if you are not to be recompensed,

Translation: Saheeh International

Tafsir

why then if you are not going to face a reckoning if you are not going to be requited by your being resurrected in other words why then if you are not going to be resurrected as you claim

Excerpt from Tafsir al-Jalalayn, commentary on 56:86, via Quran.com. The reader has the full commentary and 9 more tafsirs.