Skandapurana 1.4.37.35

1.4.37.35

madhyasūtre kaṭāhe ca pālakāṃstāñchṛṇuṣva me..
vasudhāmā sthitaḥ pūrve śaṃkhapālaśca dakṣiṇe.. 39.35 ..

Hear from me of those guardians in the central thread and in the cosmic shell: / Vasudhāman is stationed in the east, and Śaṅkhapāla in the south;