The fish of al-Khidr
The fish Moses and his servant took for provision; at the rock it made its way into the sea in a tunnel — the sign of Moses' meeting with al-Khidr, which Satan made the servant forget to mention.
In the Qur'an · 2
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فَلَمَّا بَلَغَا مَجْمَعَ بَيْنِهِمَا نَسِيَا حُوتَهُمَا فَٱتَّخَذَ سَبِيلَهُۥ فِى ٱلْبَحْرِ سَرَبًا
And when they reached the point where the two met, they forgot their fish, and it took its way into the waters, being free.
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قَالَ أَرَءَيْتَ إِذْ أَوَيْنَآ إِلَى ٱلصَّخْرَةِ فَإِنِّى نَسِيتُ ٱلْحُوتَ وَمَآ أَنسَىٰنِيهُ إِلَّا ٱلشَّيْطَـٰنُ أَنْ أَذْكُرَهُۥ ۚ وَٱتَّخَذَ سَبِيلَهُۥ فِى ٱلْبَحْرِ عَجَبًا
He said: Didst thou see, when we took refuge on the rock, and I forgot the fish - and none but Satan caused me to forget to mention it - it took its way into the waters by a marvel.