महाकालिकावतारवर्णनं नाम पञ्चचत्वारिंशोऽध्यायः
Mahakalika incarnation description Chapter 45
Sage said (to King Suratha with the merchant Samadhi)
तदा द्वावसुरौ जातौ विष्णोः कर्णमलेन वै |
मधुकैटभनामानौ विख्यातौ पृथिवीतले || 53 ||
Then two demons were born actually of ear dirt (wax) of Lord Vishnu, with the names Madhu and Kaitabha, well known on the earth.
These events (meeting of King Suratha, merchant Samadhi and the sage, who tells how the supreme Goddess killed various demons) are described in more detail in Durga Saptashati (Devi Mahatmyam), which is a part of Markandeya Purana.