Khidr "the Green One", also transcribed as Khidar, Khizr, Khyzer, Khizar, Kezr) is a revered figure in Islam, whom the Qur'an describes as a righteous servant of God, who possessed great wisdom or mystic knowledge, represented iconically by a fish. He is most often said to be a contemporary of Moses, but in other variations of his story, he lived at the same time as Abraham, the mythical Persian king Afridun, Alexander the Great, and Nashiya bin Amus . The 18th sura ("The Cave") presents a narrative where Khidr accompanies Moses and tests him about his oath to not ask any questions.

In medieval Islamic tradition, Khidr is variously described as a messenger or a prophet.

In chapter 18, verses 65–82, Moses meets the Servant of God, referred in the Quran as "one from among Our friend whom We had granted mercy from Us and whom We had taught knowledge from Ourselves", at the junction of the two seas and asks for permission to accompany him so Moses can learn "right knowledge of what [he has] been taught". The Servant of God informs him in a stern manner that their knowledge is of different nature and that "Surely you [Moses] cannot have patience with me. And how canst thou have patience about things about which thy understanding is not complete?" Moses promises to be patient and obey him unquestioningly, and they set out together. After they board a ship, the Servant of God damages the vessel. Forgetting his oath, Moses says, "Have you made a hole in it to drown its inmates? Certainly you have done a grievous thing." The Servant of God reminds Moses of his warning, "Did I not say that you will not be able to have patience with me?" and Moses pleads not to be rebuked.

Israr Ahmed (Urdu: اسرار احمد; April 26, 1932 – April 14, 2010) was a Pakistani Islamic theologian followed particularly in South Asia and also among the South Asian diaspora in the Middle East, Western Europe, and North America. Born in Hissar, (today's Haryana) in India, the second son of a government servant, he is the founder of the Tanzeem-e-islami, an off-shoot of the Jamaat-e-Islami.He has spent more than 50 years preaching Quraan.He hosted a daily show on Peace TV, a 24 hours Islamic channel broadcast internationally, and until recently^[when?] on ARY Qtv.

Ahmad was born on April 26, 1932 in Hisar (a district of East Punjab, now a part of Haryana) in India, the second son of a government servant. He graduated from King Edward Medical College (Lahore) in 1954 and later received his Master's degree in Islamic Studies from the University of Karachi in 1965. He came under the influence of 'Abul Ala Maududi' as a young student, worked briefly for Muslim Student's Federation in the Independence Movement and, following the creation of Pakistan in 1947, for the Islami Jamiat-e-Talaba and then for the Jamaat-e-Islami. Ahmad resigned from the Jama`at in April 1957 because of its involvement in the electoral politics, which he believed was irreconcilable with the revolutionary methodology adopted by the Jama'at in the pre-1947 period.