إِنَّ الشَّيْطَانَ يَجْرِي مِنَ الْإِنْسَانِ مَجْرَى الدَّمِ
Translation: Satan runs through the human being as blood runs.
Source: البخاري ومسلم
The narration warns of satanic whispering and temptation. مَجْرَى الدَّمِ means “the course of blood.” The expression highlights the need to guard against temptation; it should not be converted into a medical claim or diagnostic test. A passing unwanted thought is not the same as deliberately choosing an action.
الشَّيْطَانَ is the noun governed by إِنَّ, while يَجْرِي is a present-tense verb. مِنَ الْإِنْسَانِ contains the preposition مِنْ, and مَجْرَى الدَّمِ is an iḍāfah construction signifying a flow or course.
Pausing before harmful decisions, remembering Allah, and choosing a wholesome environment are practical safeguards.