The Rigveda gathers its hymns into ten mandalas, of which the family books are attributed to particular rishi lineages. Its suktas include the Nasadiya Sukta on the origin of things, the Purusha Sukta, and the verse to Savitr that came to be recited as the Gayatri. The Dana Sukta of its tenth mandala speaks directly of giving.
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The Gayatri Mantra is not a standalone prayer. It is a single verse of the Rigveda — 3.62.10 — composed by Rishi Vishvamitra.
Source: Rigveda 3.62.10