Hajj

Al-Baqara [2:196] 

And complete the hajj or `Umrah in the service of Allah. But if ye are prevented (from completing it) send an offering for sacrifice, such as ye may find and do not shave your heads until the offering reaches the place of sacrifice. And if any of you is ill or has an ailment in his scalp, (necessitating shaving) (he should) in compensation either fast, or feed the poor, or offer sacrifice; and when ye are in peaceful conditions (again) if anyone wishes to continue the 'Umrah on to the hajj, he must make an offering such as he can afford, but if he cannot afford it, he should fast three days during the hajj and seven days on his return making ten days in all. This is for those whose household is not in (the precincts of) the Sacred Mosque. And fear Allah, and know that Allah is strict in punishment.