The third pillar of Islam is zakat, or almsgiving. A religious obligation, zakat is considered an expression of devotion to God. It represents the attempt to provide for the poorer sectors of society, and it offers a means for a Muslim to purify his or her wealth and attain salvation. The Qur'an, together with other Islamic traditions, strongly encourages charity and constantly reminds Muslims of their moral obligation to the poor, orphans, and widows; however, it distinguishes between general, voluntary charity (sadaqa) and zakat, the latter being an obligatory charge on the money or produce of Muslims. While the meaning of terms has been open to different interpretations, the Qur'an regularly refers to zakat, identifying specific ways in which this tax can be spent. These specific uses include spending zakat on the poor and the needy, on those who collect and distribute zakat, on those whom Muslims hope to win over and convert to Islam, on travelers, on the ransom of captives, to relieve those who are burdened with debts, and on the cause of God.

The Qur'an provides less-detailed information about the kinds of things that are subject to the zakat tax or the precise share of income or property that should be paid as zakat. These determinations are provided in the traditions of the prophet Muhammad and have been the subject of elaborate discussions among Muslim legal experts, or jurists. For example, one-fortieth (2.5 percent) of the assets accumulated during the year (including gold, silver, and money) is payable at the end of the year, while one-tenth of the harvest of the land or date trees is payable at harvest time. Cattle, camels, and other domestic animals are subject to a more complex taxation system that depends on the animals in question, their age, the numbers involved, and whether they are freely grazing. Traditional zakat laws do not cover trade, but commercial taxes have been imposed by various Muslim governments throughout history.

The fourth pillar of Islam is sawm, or fasting. Clear Qur'anic references to fasting account for the early introduction of this ritual practice. The Qur'an prescribes fasting during the month of Ramadan, the 9th month of the 12-month Islamic lunar year . The month of Ramadan is sacred because the first revelation of the Qur'an is said to have occurred during this month. By tradition the month starts with the sighting of the new moon by at least two Muslims. For the entire month, Muslims must fast from daybreak to sunset by refraining from eating, drinking, and sexual intercourse. Menstruating women, travelers, and sick people are exempted from fasting but have to make up the days they miss at a later date.

According to various traditional interpretations, the fast introduces physical and spiritual discipline, serves to remind the rich of the misfortunes of the poor, and fosters, through this rigorous act of worship, a sense of solidarity and mutual care among Muslims of all social backgrounds. Thus Muslims usually engage in further acts of worship beyond the ordinary during Ramadan, such as voluntary night prayer, reading sections from the Qur'an, and paying voluntary charity to the poor. Muslims may even choose to wake before daybreak to eat a meal that will sustain them until sunset. After the fasting ends, the holiday of breaking the fast, 'id al-fitr, begins, lasting for three days.

At any time of year fasting is also required as a compensation for various offenses and violations of the law. Many Muslims also perform voluntary fasts at various times of the year as acts of devotion and spiritual discipline. However, such additional fasting is not required by Islamic law.

The fifth pillar requires that Muslims who have the physical and financial ability should perform the pilgrimage, or hajj, to Mecca at least once in a lifetime. The ritual of pilgrimage was practiced by Arabs before the rise of Islam and continues from the early days of Islam. The hajj is distinct from other pilgrimages. It must take place during the 12th lunar month of the year, known as Dhu al-Hijja, and it involves a set and detailed sequence of rituals that are practiced over the span of several days. All of the pilgrimage rituals take place in the city of Mecca and its surroundings, and the primary focus of these rituals is a cubical structure called the Kaaba. According to Islamic tradition, the Kaaba, also referred to as the House of God, was built at God's command by the prophet Ibrahim (Abraham of the Hebrew and Christian Bibles) and his son Ismail .

The Qur'an provides detailed descriptions of various parts of the ritual, and it portrays many of these rituals as reenactments of the activities undertaken by Ibrahim and Ismail in the course of building the Kaaba. Set into one corner of the Kaaba is the sacred Black Stone, which according to one Islamic tradition was given to Ibrahim by the angel Gabriel. According to another Islamic tradition this stone was first set in place by Adam.

Once pilgrims arrive in Mecca, ritual purification is performed. Many men shave their heads, and most men and women put on seamless white sheets. This simple and common dress symbolizes the equality of all Muslims before God, a status further reinforced by the prohibition of jewelry, perfumes, sexual intercourse, and hunting. After this ritual purification, Muslims circle the Kaaba seven times, run between al-Safa and al-Marwa, two hills overlooking the Kaaba, seven times, and perform several prayers and invocations. This ritual is a reenactment of the search by Hagar for water to give her son Ismail.

After these opening rituals, the hajj proper commences on the seventh day and continues for the next three days. Again, it starts with the performance of ritual purification followed by a prayer at the Kaaba mosque. The pilgrims then assemble at Mina, a hill outside Mecca, where they spend the night. The next morning they go to the nearby plain of Arafat, where they stand from noon to sunset and perform a series of prayers and rituals. The pilgrims then head to Muzdalifa, a location halfway between Arafat and Mina, to spend the night. The next morning, the pilgrims head back to Mina, on the way stopping at stone pillars symbolizing Satan, at which they throw seven pebbles.

The final ritual is the slaughter of an animal (sheep, goat, cow, or camel). This is a symbolic reenactment of God's command to Ibrahim to sacrifice his son Ismail, which Ibrahim and Ismail duly accepted and were about to execute when God allowed Ibrahim to slaughter a ram in place of his son. (In the Hebrew and Christian Bibles, Abraham is called to sacrifice his son Isaac rather than Ishmael.) Most of the meat of the slaughtered animals is to be distributed to poor Muslims. The ritual sacrifice ends the hajj and starts the festival of the sacrifice, 'id al-adha. The festivals of breaking fast ('id al-fitr) at the end of Ramadan and 'id al-adha are the two major Islamic festivals celebrated by Muslims all over the world.

During the pilgrimage most Muslims visit Medina, where the tomb of the Prophet is located, before returning to their homes. If the pilgrimage rituals are performed at any time of the year other than the designated time for hajj, the ritual is called umra. Although umra is considered a virtuous act, it does not absolve the person from the obligation of hajj. Most pilgrims perform one or more umras before or after the hajj proper.

Many Muslims pilgrims also travel to Jerusalem, which is the third sacred city for Islam. Muslims believe Muhammad was carried to Jerusalem in a vision. The Dome of the Rock houses the stone from which Muhammad is believed to have ascended to heaven and Allah in a night journey. Some Muslims perform pilgrimages to the Dome of the Rock and to other shrines where revered religious figures are buried. Some of these shrines are important primarily to the local populations, whereas others draw Muslims from distant regions. There are no standard prescribed rituals for these pilgrimages nor are they treated as obligatory acts of worship.