Khidr
Islamic perspectives
Al-Tabari seems more inclined to believe that al-Khiḍr lived during the time of Afridun before Moses, rather than traveled as Abraham's companion and drank the water of life. He does not state clearly why he has this preference, but rather seems to prefer the chain of sources (the isnad) of the former story rather than the latter.
Islamic perspectives
The various versions in al-Tabari's History more or less parallel each other and the account in the Quran. However, in the stories al-Tabari recounts, Moses claims to be the most knowledgeable man on earth, and God corrects him by telling him to seek out al-Khiḍr. Moses is told to bring a salted fish, and once he found the fish to be missing, he would then find al-Khiḍr. Moses sets out with a travel companion, and once they reach a certain rock, the fish comes to life, jumps into the water, and swims away. It is at this point that Moses and his companion meet al-Khiḍr.
Theories on origin
The source of the Quranic episode of Moses' journey with al-Khiḍr has been the subject of different opinions of various scholars. Like some other scholars, Brannon notes that the story does not appear to have any direct Christian or Jewish antecedent. But a very recent study has shown that the Qur'anic story is full of Jewish symbols, even if we cannot historically identify its likely original form.