...describe how an old man tells Alexander to command his cook to take the salted fish and wash it at every spring of water he finds. When the fish comes to life, the old man explains, the cook will have found the water of life. The sermon then continues by mentioning how the cook was washing the fish in the spring when it comes to life and swims away. The cook, fearing Alexander may want the fish back, jumps into the water to retrieve the fish and gains immortality himself...
"Behold, Moses said to his attendant, "I will not give up until I reach the junction of the two seas or (until) I spend years and years in travel." But when they reached the Junction, they forgot (about) their Fish, which took its course through the sea (straight) as in a tunnel. When they had passed on (some distance), Moses said to his attendant: "Bring us our early meal; truly we have suffered much fatigue at this (stage of) our journey." He replied: "Sawest thou (what happened) when we betook ourselves to the rock? I did indeed forget (about) the Fish: none but Satan made me forget to tell (you) about it: it took its course through the sea in a marvellous way!" Moses said: "That was what we were seeking after:" So they went back on their footsteps, following (the path they had come). So they found one of Our servants, on whom We had bestowed Mercy from Ourselves and whom We had taught knowledge from Our own Presence." (Qur'an 18:60-65)
Also see from TDR's link:
http://en.wikipedia.org/wiki/Khidr#Comparative_mythologyThere are several versions of the Alexander romance in which al-Khiḍr figures as a servant of Alexander the Great. in one version, al-Khiḍr and Alexander — identified with Dhul-Qarnayn — cross the Land of Darkness to find the Water of Life. Dhul-Qarnayn gets lost looking for the spring but al-Khiḍr finds it and gains eternal life. In the Iskandarnamah by an anonymous author, al-Khiḍr is asked by Dhul-Qarnayn to lead him and his armies to the Water of Life.[106] Al-Khiḍr agrees, and eventually stumbles upon the Water of Life on his own.[107]
Some scholars suggest that al-Khiḍr is also represented in the Arthurian tale Sir Gawain and the Green Knight as the Green Knight.[108] In the story, the Green Knight tempts the faith of Sir Gawain three times. The character of al-Khiḍr may have come into European literature through the mixing of cultures during the Crusades.[109] It is also possible that the story derives from an Irish myth which predates the Crusades in which Cú Chulainn and two other heroes compete for the curadmír, the select portion given to champions, at feasts; ultimately, Cú Chulainn is the only one willing to let a giant — actually a king who has magically disguised himself — cut off his head, as per their agreement.
The story is also similar to one told by Rabbi Nissim ben Jacob in the eleventh century of a journey made by Elijah and Rabbi Joshua ben Levi.[110][111] The first house where they stay the night belongs to a pious old couple who give the prophet and the rabbi the best of their food and beds. However, the couple's cow dies in the night. Elijah later explains that the Angel of Death came and he persuaded the angel to take the cow instead of the wife. The next house, as in the al-Khiḍr story, is that of a rich miser, and Elijah repairs his wall so that he will not, in having it repaired, find the treasure hidden under it.
A third potential parallel to the legend surrounding al-Khiḍr is the Epic of Gilgamesh.[112] The episode in question takes place after the death of king Gilgamesh's closest friend Enkidu.
Gilgamesh goes on a journey to find his ancestor Utnapishtim, a wise figure who was granted immortal life and who lives at the mouth of two rivers.[112] Ultimately, although Gilgamesh finds Utnapishtim, he is not able to attain immortality. Although the parallel is not exact, the story shares several major themes with both Surah 18 in the Quran and the Alexander romance, namely, the presence of a wise figure in all three stories, and the quest and ultimate failure to attain immortality in the epic of Gilgamesh and the Alexander romance.[113]