The Holy Quran 70:28 — Surah Al-Ma'arij

Arabic text

إِنَّ عَذَابَ رَبِّهِمْ غَيْرُ مَأْمُونٍ

Indeed the punishment of their Rabb is not something not to be afraid of. (feared of)

that is, the punishment of Allah is not such a thing that a servant could feel safe from it and sit back without a care.

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