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A Qareen (Arabic: قرين qarīn literally meaning: 'constant companion') is a spiritual double of human, either part of the human himself or a complementary creature in a parallel dimension. Due to its ghostly nature, the Qareen is classified among the Jinn-type creatures, although usually not actually a Jinni. The Qareen as an accompanying spirit should not be confused with the Qarinah as a female "childbed demon" also existing in Middle Eastern faith.
Qareen are mentioned by name in the following Quran verses:
Several opinions exist on the exact nature of the Qareen. According to one opinion, the Qareen is actually a Shaitan, who incites humans with waswās ("evil suggestions"), but can became good in accordance with humans good deeds. For example, it is said, that the Qareen of Muhammad became Muslim. However it is uncertain, whether or not, a Qareen besides those of Muhammad, can actually become good.
Another opinion holds that Qareen refers to any type of spirit accompanying humans. Here, the Qareen refers to both demons, who cast evil suggestions, but also to angels, who advise to do good deeds.
Further the Qareen is depicted as the other self: An integral spirit which is part of the person. A dissent between the inner Qareen and the behavior may cause the same symptoms as Jinn-possession.
With regard to the hadith of Muhammad, "There is none of you who does not have a companion (Qareen) appointed for him from among the jinn." They said, "Even you?" He said, "Even me, but Allah helped me against him fa aslama [or fa aslamu], so he only tells me to do that which is good."
There are two well-known views that have been reported. Those who read the phrase as fa aslamu said that it means, "So I am safe [aslamu] from his evil and temptation." Those who read it as fa aslama said that it means, "The Qareen became Muslim [aslama] and became a believer, so he only tells me to do that which is good."
They differed as to which view is correct. Al-Khattaabi said: The correct version is fa aslamu [so I am safe]. Al-Qaadi Iyaad thought that fa aslama [so he became Muslim] was correct, and this is the preferred version, because he then said, "so he only tells me to do that which is good." (Reported by Muslim, 2814). And they differed concerning the report that says fa aslama. It was said that it means he submitted in the sense of surrendering, and it appears in this form (fa astaslama – so he surrendered) in reports narrated elsewhere than in Saheeh Muslim. And it was said that it means that he become a Muslim and a believer. This is the apparent meaning.
Abu Na’eem al-Asbahaani said in Dalaa’il al-Nubuwwah (1/185): It was said aslama meaning he believed. Muhammad was the only one whose Qareen became a Muslim and a believer.
Based on this, having one's Qareen become a Muslim was something that was unique to Muhammad.
Furthermore, there is no evidence that the Companions (Sahaba) ever tried to convert their Qareen to become a Muslim.
The concept of a Qareen appears in pre-Islamic literature as well, and is reminiscent of the Greek daimones and the Christian guardian angel. In Pre-Islamic Arabian the Qareen is said to be able to inspire poets for their works.
One of the seven mu'allaqat—Arabic poems recognized as masterpieces during the pre-Islamic period—uses the word as a metaphor. To describe his tribe's excellence in battle, poet Amr bin Kulthum says that "every tribe has taken fear of us as a qarin (or "constant companion")," meaning that their fear of Amr's tribe is always present. This goes further to show the origin of the word qareen, as described in the Arabic dictionary as a 'companion'