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Niyyah is an intent one evokes in his heart to do an act of worship for the sake of Allah (God). Thus, because its seat is in the heart, it does not have to be pronounced verbally. That is why no wording for Niyyah is reported from the Prophet (s.a.s.), nor from any of his companions. Allah is the Arabic language word for God. ...
Taken from "The Prescribed Prayer Made Simple" by Tajuddin B. Shu'aib
Niyyah is the the solumn and sincere disire to do something for allah, a muslim mush have niyyah to attend the hajj.
if a musim cannot go on the Hajj, for medical reasons etc. then Niyyah will suffice.