1- Raghib al-Isfahani - Mu'jam Mufradat al-fadh al-Qur'an.
2- Mukalaf: In Islam, a boy or girl is considered adult on reaching puberty, and thus has to perform all obligatories.
3- Kulaini, Usul min al-Kafi, p. 59, vol. 1, printed in 1388 A.H.
4- Mujtahid: A person who is an expert in Islamic jurisprudence (fiqh); he is also called faqih. He has a particular power and retigious authori and significance.
5- Wajib Kifa'i: An action which remains obligatory upon the Muslims as long as it remains unfulfilled, but if Some individuals carried it out, other Muslims are absolved from the responsibility, like the profession of medicine, judiciary, agriculture, bidding for what is right and bathing the corpse and praying for him...etc.
6- Wajib 'aini: A deed which is obligatory upon an individual and the obligation still exists even if others perform it tike the daily ritual prayer, and fasting...etc.
7- Kulaini, Usul min al-Kafi, p. 59, vol. 1, printed in 1388 A.H.
8- The late Abul-Qasim al-Khu'i, Tafsir al-Bayan, p. 23, printed in 1394 A.H. -1974 A. D.
9- Ibid, p. 30.