Hinduism originated around 3000 BCE in India and has over 1 billion adherents worldwide, making it the third largest religion. It emerged as a combination of the beliefs of indigenous Indian people and beliefs brought by Aryan invaders between 1750-1200 BCE. The Vedas are the most sacred texts, consisting of hymns, mantras, and rituals. The Upanishads contain early philosophical statements that formed the basis of later Hindu philosophy. Together these texts establish the central concepts of dharma, samsara, karma, moksha, and beliefs in Brahman, Atman, and reincarnation that characterize Hinduism.