At least 383 non-Indo-European words were borrowed from this culture, including the god Indra and the ritual drink Soma. According to Anthony, The oldest inscriptions in Old Indic, the language of the Rig Veda, are found not in northwestern India and Pakistan, but in northern Syria, the location of the Mitanni kingdom. The Mitanni kings took Old Indic throne names, and Old Indic technical terms were used for horse-riding and chariot-driving. The Old Indic term r'ta, meaning "cosmic order and truth", the central concept of the Rig Veda, was also employed in the Mitanni kingdom. And Old Indic gods, including Indra, were also known in the Mitanni kingdom. Their religion was further developed when they migrated into the Ganges Plain after c. 1100 BCE and became settled farmers, further syncretising with the native cultures of northern India. The Vedic religion of the later Vedic period co-existed with local religions, such as the Yaksha cults, and was itself the product of "a composite of the Indo-Aryan and Harappan cultures and civilizations". David Gordon White cites three other mainstream scholars who "have emphatically demonstrated" that Vedic religion is partially derived from the Indus Valley Civilisation. Vedas Its liturgy is preserved in the three Vedic Samhitas: the Rigveda, Samaveda and the Yajurveda. The Vedic texts were the texts of the elite, and do not necessarily represent popular ideas or practices. Of these, the Rig-Veda is the oldest, a collection of hymns composed between ca. 1500-1200 BCE. The other two add ceremonial detail for the performance of the actual sacrifice. The Atharvaveda may also contain compositions dating to before 1000 BCE. It contains material pertinent to domestic ritual and folk magic of the period. These texts, as well as the voluminous commentary on orthopraxy collected in the Brahmanas compiled during the early 1st millennium BCE, were transmitted by oral tradition alone until the advent, in the 4th century AD, of the Pallava and Gupta period and by a combination of written and oral tradition since then. The Hindu samskaras The earliest text of the Vedas is the Rigveda, a collection of poetic hymns used in the sacrificial rites of Vedic priesthood. Many Rigvedic hymns concern the fire ritual (Agnihotra) and especially the offering of Soma to the gods (Somayajna). Soma is both an intoxicant and a god itself, as is the sacrificial fire, Agni. The royal horse sacrifice (Ashvamedha) is a central rite in