Tarasar Upanishad - Yajur Veda
Tarasar Upanishad in English rhyme
Tarasara Upanishad one of the 19 Upanishads be,
That is attached to the Shukla Yajurveda actually,
It discusses "Om" for yogic meditation specifically,
Which helps cross from mundane into spirituality,
It is one of the texts from Vaishnavism in reality,
That mentions "Om Namo Narayan" mantra clearly,
Om represents Atman, Namah represents Prakriti,
And Narayan the very nature of Parabrahman be.