The Agnihotra reference article from the English Wikipedia on 24-Apr-2004
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Agnihotra

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The Agnihotra is a Hindu religious ritual, performed at dawn. Practitioners will purify themselves with water, stir a scared fire, chant sacred verses, and recite a prayer to Agni.

The Rig-Veda (1.1) states, "Agni earned the prayers of the ancient sagess, and of those of the present, too; he will bring the gods here."

The Ani-Brahmana (1.1-19) states, "...he who does not offer the agnihotra does not come into life, at all. Therefore the agnihotra must be offered."