The four pillars (arkan) of الحج are: (1) الإحرام — entering the sacred state with intention, (2) Standing at عرفة (Wuquf) on the 9th of ذو الحجة, (3) الطواف al-Ifadah — circumambulating the الكعبة after عرفة, and (4) السعي — walking between الصفا and المروة. These are indispensable; if any pillar is missed, the الحج is invalid and cannot be compensated by a sacrifice.
Islamic jurisprudence classifies the acts of الحج into three distinct categories, and understanding this classification is essential for every الحاج. The first category is the arkan (pillars), which are the absolutely indispensable acts without which the الحج is invalid. If a الحاج misses even one pillar, no amount of sacrifice or compensation can make up for it — the الحج simply does not count, and it must be repeated. The second category is the واجبat (obligations), which are required acts whose omission does not invalidate the الحج but requires expiation, typically in the form of slaughtering a sheep (dam) and distributing its meat to the poor in the Haram area. Examples of واجبat include entering الإحرام from the designated الميقات, spending the night at مزدلفة, stoning the الجمرات, and performing the farewell الطواف (الطواف al-Wada'). The third category is the sunan (مستحب acts), which are acts النبي Muhammad performed during his الحج and are highly encouraged but carry no penalty if omitted. These include reciting the التلبية frequently, performing certain الأدعية at specific locations, and kissing the الحجر الأسود. While scholars from the four madhahib agree on the general framework, there are some differences of opinion on which acts fall into which category. What follows is the majority position recognized across the Sunni schools of thought.
الإحرام is the first and foundational pillar of الحج. Contrary to popular belief, الإحرام is not merely the wearing of the two white unstitched garments (izar and rida) for men; rather, it is the intention (niyyah) to enter the sacred state of الحج. The physical garments are a manifestation of this intention, but the true الإحرام resides in the heart. A الحاج must enter the state of الإحرام at or before the designated الميقات (boundary point) corresponding to their direction of travel. The five الميقات points were designated by Prophet Muhammad: Dhul Hulayfah for those coming from المدينة, Al-Juhfah for those from Syria and the West, Qarn al-Manazil for those from Najd, Yalamlam for those from Yemen, and Dhat Irq for those from Iraq. Upon entering الإحرام, the الحاج declares their intention for the specific type of الحج (Ifrad, Tamattu, or Qiran) and begins reciting the التلبية: 'Labbayk Allahumma Labbayk, Labbayka la sharika laka Labbayk. Innal hamda wan ni'mata laka wal mulk, la sharika lak.' From this moment, certain restrictions apply: the الحاج may not cut hair or nails, wear perfume, hunt, engage in marital relations, or (for men) wear stitched clothing or cover the head. Women maintain their regular modest dress but do not cover their faces or wear gloves, عند the majority opinion.
The standing at عرفة is considered the greatest pillar of الحج, so much so that النبي Muhammad (صلى الله عليه وسلم) declared: 'الحج is عرفة' (reported by Ahmad, Abu Dawud, al-Tirmidhi, and al-Nasa'i). This means that if a الحاج misses standing at عرفة, they have missed the الحج entirely. The standing takes place on the 9th of ذو الحجة, the Day of عرفة, in the plain of عرفة located approximately 20 kilometers southeast of مكة. The valid time for Wuquf extends from the sun's zenith (dhuhr time) on the 9th until the dawn (fajr) of the 10th of ذو الحجة. According to the majority of scholars, even a moment's presence within the boundaries of عرفة during this window is sufficient to fulfill the pillar, though remaining until sunset is strongly مستحب. The Hanbali school holds that being present at عرفة for any part of the day or night is valid, while some scholars specify that presence during the daytime is required with compensation (dam) needed if one only stands at night. At عرفة, الحجاج spend their time in fervent الدعاء, seeking Allah's forgiveness, reciting القرآن, and making دعاء. النبي said that there is no day on which Allah frees more people from the Hellfire than the Day of عرفة. After sunset, الحجاج depart for مزدلفة, where they spend the night under the open sky and collect pebbles for the stoning ritual.
الطواف al-Ifadah, also known as الطواف al-Ziyarah (the الطواف of Visiting), is the third pillar of الحج and consists of circling the الكعبة seven times in a counterclockwise direction. This الطواف is performed after the الحاج leaves عرفة and مزدلفة and returns to مكة, typically on the 10th, 11th, or 12th of ذو الحجة. It is distinguished from الطواف al-Qudum (the arrival الطواف) and الطواف al-Wada' (the farewell الطواف), both of which are واجب or سنة but not pillars. The القرآنic basis for this pillar is found in Surah Al-الحج (22:29): 'Then let them complete their prescribed duties and fulfill their vows and circumambulate the Ancient House.' Each circuit begins and ends at the الحجر الأسود (al-Hajar al-Aswad), and the الحاج walks with the الكعبة on their left side. During الطواف, الحجاج supplicate freely, recite القرآن, and engage in dhikr (remembrance of Allah). The first three circuits are performed at a brisk pace (raml) by men during الطواف al-Qudum, but this is not required for الطواف al-Ifadah عند the majority opinion. After completing the seven circuits, the الحاج prays two ركعةs behind مقام إبراهيم (the Station of Ibrahim) if possible, or anywhere in the مسجد. The الحاج then drinks from زمزم water before proceeding to perform السعي.
السعي is the ritual of walking seven times between the hills of الصفا and المروة, which are now enclosed within the المسجد الحرام complex. This act commemorates the desperate search of Hajar (Hagar), the wife of Prophet Ibrahim, as she ran between these two hills looking for water for her infant son Ismail. Her trust in Allah was rewarded when the angel Jibril (Gabriel) struck the ground and the spring of زمزم gushed forth. The القرآنic reference is in Surah Al-Baqarah (2:158): 'Indeed, الصفا and المروة are among the symbols of Allah. So whoever makes الحج to the House or performs العمرة — there is no blame upon him for walking between them.' The السعي begins at الصفا and ends at المروة, with each one-way trip counting as one lap; thus the الحاج walks from الصفا to المروة (one), المروة to الصفا (two), and so on until completing seven laps, ending at المروة. Between the two hills, there is a section marked by green lights where men are encouraged to jog lightly (this commemorates Hajar's frantic running in the valley where she lost sight of Ismail). Women walk at their normal pace throughout. The السعي can be performed immediately after الطواف al-Ifadah or, in the case of Tamattu الحج, the الحاج may have already performed السعي after their العمرة الطواف and may perform another السعي for الحج. The Shafi'i and Hanbali schools consider السعي a pillar, while the Hanafi school classifies it as واجب — though practically, all schools agree it must be performed for a complete الحج.