So far, we have seen Jnāna Yoga, the means to attain the experience of the self as well as the Upasana of Rudra-Shariraka-Paramatma in the Atharvasiras that has the paśupata vrata as an accessory . There is an interesting section on the Upasana of Śvetāśvatara maharishi which is linked to the Atharvasiras and the Ishvara Gita, the latter being a pending publication for the blog. So, this section is described here.
Who was Śvetāśvatara maharishi? The identity can be ascertained from the name itself. According to Sri Mahacharya, it is “śvetena aśvena tarati iti śvetāśvatara” – One who has Hayagriva as his means. The name of this rishi itself indicates he was a hayagrīva-upāsaka. So, the vaishnavatva of this rishi is self-evident.