Sorry, this is incorrect.
The correct answer is : He would have remained inside the fish till the day of resurrection
Ref: Surah As-Saffat 37: 144
Arabic:
لَلَبِثَ فِى بَطْنِهِۦٓ إِلَىٰ يَوْمِ يُبْعَثُونَ ١٤٤
Translation:
he would have certainly remained in its belly until the Day of Resurrection.
Tafseer / Explanation:
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Allah declares that if Prophet Yunus (Jonah) had not glorified Him in repentance,
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He would have remained imprisoned in the belly of the fish until the Day of Judgment.
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This shows how sincere remembrance and repentance can remove divine affliction.
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It emphasizes Allah’s mercy toward those who turn back to Him in humility.
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The verse highlights that constant dhikr (remembrance) protects believers from lasting punishment.