The Holy Quran 18:61 — Surah Al-Kahf
Arabic text
فَلَمَّا بَلَغَا مَجْمَعَ بَيْنِهِمَا نَسِيَا حُوتَهُمَا فَٱتَّخَذَ سَبِيلَهُۥ فِى ٱلْبَحْرِ سَرَبًا
Translation
So when they reached the confluence of the two (and lay down to rest in the shade of a boulder), they both forgot (to keep watch over) their fish and (coming to life, it escaped from the basket and) it tunnelled its path into the ocean. (Yusha عليه الصلاة والسلام happened to see this but decided to inform Moosa عليه الصلاة والسلام only after he awoke. However, when Moosa عليه الصلاة والسلام woke up, Yusha عليه الصلاة والسلام forgot to tell him about it and they proceeded further.)
Tafsir (excerpt) — Tafsir Usmani
The fish goes missing: on arriving there, Musa ﵇ fell asleep near a large rock beneath which flowed a spring of the water of life. Yusha' ﵇ saw the fried fish باذن اللہ (by Allah's leave) come to life, slip out of the basket and make its way into the sea in a wondrous manner, as though boring a tunnel.
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