﴿ قَالَ ذَٰلِكَ مَا كُنَّا نَبْغِ ۚ فَٱرْتَدَّا عَلَىٰٓ ءَاثَارِهِمَا قَصَصًۭا ﴾

“[Moses] exclaimed: "That [was the place] which we were seeking!, And the two turned back, retracing their footsetps,”

Said he Moses ‘That namely our losing the fish is what we have been seeking!’ what we have been after for it is a sign for us of the presence of the one whom we seek. So they turned back retracing their footsteps until they reached the rock.