वासिष्ठकथनम् (आदित्य–सोमवंशवर्णनम् तथा रुद्रसहस्रनाम-प्रशंसा)
छायाशापात् पदं चैकं यमस्य क्लिन्नमुत्तमम् पूयशोणितसम्पूर्णं कृमीणां निचयान्वितम्
chāyāśāpāt padaṃ caikaṃ yamasya klinnamuttamam pūyaśoṇitasampūrṇaṃ kṛmīṇāṃ nicayānvitam
By the curse of Chāyā, one foot of Yama became grievously ulcered—oozing and foul—filled with pus and blood, and swarming with heaps of worms.
Suta Goswami (narrating to the sages of Naimisharanya)
It frames karma as pasha (bondage): impurity and harm inevitably mature into suffering, motivating the pashu (soul) to seek Shiva (Pati) through dharma and Shiva-puja for purification and release.
Indirectly: even Yama, the enforcer of dharma, is subject to karmic consequence and curse, highlighting that only Shiva-tattva stands beyond bondage while embodied agents remain within the law of cause and effect.
No specific rite is stated; the takeaway aligns with Pashupata discipline—ethical restraint and expiation (prāyaścitta) as preparatory purification supporting Shiva-upāsanā that loosens pasha.