The Holy Quran 78:5 — Surah An-Naba
Arabic text
ثُمَّ كَلَّا سَيَعْلَمُونَ
Translation
Take heed again! They will soon come to know.
Tafsir (excerpt) — Tafsir Usmani
They will soon know about the Day of Resurrection: that is, from the beginning of the world until today the prophets have explained a great deal, but people will by no means desist from their disagreements and questioning.
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