Irtimās (Arabic: اِرتماس , lit: Immersion) is a term in jurisprudence meaning immersion of the head about which there are discussions in jurisprudential books in the parts of tahara (purity), hajj and fasting. According to Shi'a jurists, immersion of the head in the water is forbidden for a person wearing ihram and a person who is fasting. Also, some have considered immersion among the invalidators of fasting.
- If a person does not immerse his head in the water intentionally, irtimas is not occured and his fasting and hajj are not invalidated.
- According to a group of jurists, based on caution, immersing the head in mudaf water is also considered irtimas.
- According to some, if the scull of the head is out of the water upon immersing the head in water, the fating is valid.
- There is no difference in immersing the head in water at once or gradually.
- The material for this article is mainly taken from ارتماس in farsi WikiShia.