Garudapurana 1.28.10

1.28.10

trailokyarakṣakaṃ cakramasurārisudarśanam /
hṛdādipūrvakoṇaṣu astraṃ śaktiṃ ca pūrvataḥ //

Sudarśana, the protector of the three worlds and enemy of the asuras; / in the corners starting with the eastern [corner] for the heart and other limbs, and in the east the weapon and the power;