By far the most important ceremony of boyhood was that of apprenticeship to a teacher or initiation (upanayana), which in the case of a Brahman may take place between the eighth and sixteenth year, but a few years later in the case of the Kshatriya and the Vaiçya. On this occasion the youth receives a staff, a garment, a girdle, and a cord worn over one shoulder and under the other arm. The first is made of different wood, the others of different materials according to caste. The sacred cord is the outward token of the Arya or member of one of the three highest castes, and by investiture with it he attains his second birth, being thenceforward a "twice-born" man (dvi-ja). The spiritual significance of this initiation is the right to study the Veda, and especially to recite the most sacred of prayers, the Savitri. In this ceremony the teacher (acharya) who initiates the young Brahman is regarded as his spiritual father, and the Savitri as his mother.
The rite of upanayana is still practised in India. It is based on a very old custom. The Avestan ceremony of investing the boy of fifteen with a sacred cord upon his admission into the Zoroastrian community shows that it goes back to Indo-Iranian times. The prevalence among primitive races all over the world of a rite of initiation, regarded as a second birth, upon the attainment of manhood, indicates that it was a still older custom, which in the Brahman system became transformed into a ceremony of admission to Vedic study.
Besides his studies, the course of which is regulated by detailed rules, the constant duties of the pupil are the collection of fuel, the performance of devotions at morning and evening twilight, begging food, sleeping on the ground, and obedience to his teacher.
At the conclusion of religious studentship (brahmacharya), which lasted for twelve years, or till the pupil had mastered his Veda, he performs the rite of return (samavartana), the principal part of which is a bath, with which he symbolically washes off his apprenticeship. He is now a snataka ("one who has bathed"), and soon proceeds to the most important sacrament of his life, marriage. The main elements of this ceremony doubtless go back to the Indo-European period, and belong rather to the sphere of witchcraft than of the sacrificial cult. The taking of her hand placed the bride in the power of her husband. The stone on which she stepped was to give her firmness. The seven steps which she took with her husband, and the sacrificial food which she shared with him, were to inaugurate friendship and community. Future abundance and male offspring were prognosticated when she had been conducted to her husband's house, by seating her on the hide of a red bull and placing upon her lap the son of a woman who had only borne living male children. The god most closely connected with the rite was Agni; for the husband led his bride three times round the nuptial fire--whence the Sanskrit name for wedding, pari-naya, "leading round"--and the newly kindled domestic fire was to accompany the couple throughout life. Offerings are made to it and Vedic formulas pronounced. After sunset the husband leads out his bride, and as he points to the pole-star and the star Arundhati, they exhort each other to be constant and undivided for ever. These wedding ceremonies, preserved much as they are described in the Sutras, are still widely prevalent in the India of to-day.