Ghayrah (Arabic: غيرة) (sometimes transliterated Gheera, Ghirah, or Ghayra) is an Arabic word which means "protective jealousy" or "justifiable jealousy." From the Islamic perspective, it is seen as a good and necessary type of jealousy that men have for the womenfolk (e.g. their wife, their sisters, and their daughters) and is perceived as a necessary part of Islam. The concept asserts that all Muslim men should have a collective sense of protectiveness for Muslim women.
The term is based on the following Quran verses:
Men who do not have Ghayrah are called Dayyuth (Arabic: ديوث). Being a Dayyuth is a major sin and a description of what is deemed an evil characteristic can be found in Az-Zahabi's book of Major Sins (Al-Kaba'ir). The prophet Mohammed and his companions were known to have very strong Ghayrah.
Although it is claimed that the concept of Ghayrah is the source of honor killings in the Islamic world,Salafi scholar Muhammad Al-Munajjid asserts that punishment of any crime is reserved for the Islamic ruler noting that the penalty for fornication (unmarried sexual relationships for unmarried people) is 100 lashes. As it is a Muslim man's role as the guardian of his family, he is responsible for those in his custody and it is his duty to observe the conduct of his wife and children; although this does allow him to be overly suspicious or exceed the acceptable standards of supervision. For conservative Muslims, the enforcement of the wearing of the hijab by a Muslim man's wife and daughters and the prevention of the free mingling between the sexes for those under a Muslim man's guardianship are necessary actions under the concept of Ghirah to preserving one's honor. Per Salafi scholar Al-Munajjid, if a Muslim man suspects that certain family members will commit an immoral act, he is allowed to tie up or otherwise detain them in order to prevent the action.
Salafi scholar Muhammad Al-Munajjid indicates that the concept also applies to protecting the Prophet Mohammed from blasphemy although the determination of guilt and application of the penalty (execution) is to be solely applied by Islamic authorities.