Tafsir of Al-Hijr 15:92

{فَوَرَبِّكَ لَنَسْأَلَنَّهُمْ أَجْمَعِينَ}

{لَنَسْأَلَنَّهُمْ}: An expression of threat.

It is also said: He will ask them a question of rebuke.

From Abu al-Aliyah: The servants will be asked about two things: what they used to worship, and what they answered the messengers.

{فَاصْدَعْ بِمَا تُؤْمَرُ وَأَعْرِضْ عَنِ الْمُشْرِكِينَ}