Surah As-Saffat 37:144

لَلَبِثَ فِى بَطْنِهِۦٓ إِلَىٰ يَوْمِ يُبْعَثُونَ

He would have remained inside its belly until the Day they are resurrected.

Translation: Saheeh International

Tafsir

he would have tarried in its belly until the day when they are raised in other words the whale’s belly would have been his tomb until the Day of Resurrection.

Excerpt from Tafsir al-Jalalayn, commentary on 37:144, via Quran.com. The reader has the full commentary and 9 more tafsirs.