I have compiled a number of narrations on "The Spring of Life", which appears in many of our narrations and "the one who drinks from it would not die until it so happens that he is the one who asks Allah (سُبْحَانَهُ وَ تَعَالَى) for the death" (Tafseer al Ayyashi 2 : 79 /341). It is also said in many narrations that al Khidr (عليه السلام) drank from this spring (see below):
The story of al Khidr and Dhulqarnain is mentioned in Chapter 18 of the Qur'an (Surah Kahf). Although the Qur'an does not explicitly mention "The Spring of Life", it hints towards it when Yusha loses the fish. In both Sunni and Shi'a books, Chapter 18 of the Qur'an is a key chapter to protect us from the fitna of Dajjal, where it is mentioned in our books that the one who recites it would be safe from the fitna of Dajjal, so we should pay special attention to it. It is also recommended to recite it on Friday (or Friday night) (see https://hubeali.com/books/English-Books/TafseerHub-e-Ali/CH18_SuraAlKahf_Verses1-49.pdf).