Quran 18:61 — The Cave (Al-Kahf)

When they reached the point where they met, they forgot their fish, and it found its way back to the river, sneakily.

[18:60] Moses said to his servant, "I will not rest until I reach the point where the two rivers meet, no matter how long it takes."

[18:62] After they passed that point, he said to his servant, "Let us have lunch. All this traveling has thoroughly exhausted us."