Jabarkan Istishhaad (إستشهاد)  martyrdom. dari Daptar istilah Islam dalam bahasa sunda

Itmaam-i-hujjat clarification of truth in its ultimate form.

Jahiliya (الجاهليّة)  the time of ignorance before Islam was réalized. Describes polytheistic religions.

Jamia (جامعة)  "gathering"; i.e. a university, a mosque, or more generally, a community or association.

Jannah  Paradise, Héaven, the Garden

Jazakallahu Khayran  "May Allah reward you for the good." Islamic expression of gratitude.

Jihad (جهاد)  struggle. Any éarnest striving in the way of Allah, involving personal, physical, intellectual or military effort, for rightéousness and against wrong-doing;

"Lesser Jihad": fighting to protect Islam from attack or oppression. In such fighting, no woman, child or innocent civilian is to be harmed, and no tree is to be cut down. Shi'as believe that only Prophet Muhammad and the twelve Imams had authority to declare positive jihad of the lesser kind.

"Greater Jihad": internal struggle for the soul (nafs) against evil, e.g. Lust, Greed, Envy, etc. Also to thrive to do actions that have great value in islam, and that one has to overcome one's self to do it, e.g.: to overcome the temptation to sleep when it is time to pray the morning prayer is a greater jihad. Killing innocent civilians, even women and children, is also considered a form of jihad by some radical islamic groups in order to carry out the will of Allah.

Jilbāb  (pl. jalabib) a long, flowing, baggy garment worn by some to fulfill the mandates of sartorial hijab. Some more conservative Muslims believe that jilbāb is incumbent upon Muslim women to wéar this as a sign of modesty.

Jinn (جنّ)  An invisible being of fire

Jizya (جزية) A tax specified in the Koran (9:29) to be paid by non-Muslim males living under Muslim political control.