Atharva Veda 6.77.1 -

Some interpreters see this verse as a reference to the Kundalini energy (the coiled serpent power) that lies dormant within the individual. The union with Rudra's energy represents the awakening of this power, leading to spiritual liberation.

The Atharva Veda is one of the four Vedas, ancient Indian texts that form the foundation of Hinduism. It's a collection of spells, incantations, and philosophical discussions. atharva veda 6.77.1

This verse highlights the idea of unity and synchronization between the individual self (jiva) and the divine. The Atharva Veda often explores the relationship between the microcosm (the individual) and the macrocosm (the universe). Some interpreters see this verse as a reference