For no land is impure of itself.

A land becomes so only by contact." This passage is quoted by a Hindu writer with the same reference to the Code of Manu as the preceding one, but it is not found there and appears to be a gloss by a later writer, explaining how the country south of the Vindhyas, which is excluded by Manu, should be rendered fit for Aryan settlement.

[8] Similarly in a reference in the Brahmanas to the migration of the Aryans eastward from the Punjab it is stated that Agni the fire-god flashed forth from the mouth of a priest invoking him at a sacrifice and burnt across all the five rivers, and as far as he burnt Brahmans could live.

Agni, as the god of fire by which the offerings were consumed, was addressed as follows: "We kindle thee at the sacrifice, O wise Agni, the sacrificer, the luminous, the mighty." [9] The sacrifices referred to were, in the early period, of domestic animals, the horse, ox or goat, the flesh of which was partaken of by the worshippers, and the sacred Soma-liquor, which was drunk by them; the prohibition or discouragement of animal sacrifices for the higher castes gradually came about at a later time, and was probably to a large extent due to the influence of Buddhism.
The early sacrifice was in the nature of a communal sacred meal at which the worshippers partook of the animal or liquor offered to the god.

The Dasyus or indigenous Indian races could not worship the Aryan gods nor join in the sacrifices offered to them, which constituted the act of worship.