Differences occur in the religious obligations and observances both within and between the sangha and the laity.
A. Monastic Life
From the first, the most devoted followers of the Buddha were organized into the monastic sangha. Its members were identified by their shaved heads and robes made of unsewn orange cloth. The early Buddhist monks, or bhikkus, wandered from place to place, settling down in communities only during the rainy season when travel was difficult. Each of the settled communities that developed later was independent and democratically organized. Monastic life was governed by the rules of the Vinaya Sutra, one of the three canonical collections of scripture. Fortnightly, a formal assembly of monks, the uposatha, was held in each community. Central to this observance was the formal recitation of the Vinaya rules and the public confession of all violations. The sangha included an order for nuns as well as for monks, a unique feature among Indian monastic orders. Theravadan monks and nuns were celibate and obtained their food in the form of alms on a daily round of the homes of lay devotees. The Zen school came to disregard the rule that members of the sangha should live on alms. Part of the discipline of this sect required its members to work in the fields to earn their own food. In Japan the popular Shin school, a branch of Pure Land, allows its priests to marry and raise families. Among the traditional functions of the Buddhist monks are the performance of funerals and memorial services in honor of the dead. Major elements of such services include the chanting of scripture and transfer of merit for the benefit of the deceased.
B. Lay Worship
Lay worship in Buddhism is primarily individual rather than congregational. Since earliest times a common expression of faith for laity and members of the sangha alike has been taking the Three Refuges, that is, reciting the formula “I take refuge in the Buddha. I take refuge in the dharma. I take refuge in the sangha.” Although technically the Buddha is not worshiped in Theravada, veneration is shown through the stupa cult. A stupa is a domelike sacred structure containing a relic. Devotees walk around the dome in a clockwise direction, carrying flowers and incense as a sign of reverence. The relic of the Buddha’s tooth in Kandy, Sri Lanka, is the focus of an especially popular festival on the Buddha’s birthday. The Buddha’s birthday is celebrated in every Buddhist country. In Theravada this celebration is known as Vaisakha, after the month in which the Buddha was born. Popular in Theravada lands is a ceremony known as pirit, or protection, in which readings from a collection of protective charms from the Pali canon are conducted to exorcise evil spirits, cure illness, bless new buildings, and achieve other benefits.
In Mahayana countries ritual is more important than in Theravada. Images of the buddhas and bodhisattvas on temple altars and in the homes of devotees serve as a focus for worship. Prayer and chanting are common acts of devotion, as are offerings of fruit, flowers, and incense. One of the most popular festivals in China and Japan is the Ullambana Festival, in which offerings are made to the spirits of the dead and to hungry ghosts. It is held that during this celebration the gates to the other world are open so that departed spirits can return to earth for a brief time.