Srimad-Bhagavatam: Canto 4 - Chapter 1 - Verse 22
Sanskrit:
आक्रम्योरसि दक्षस्य शितधारेण हेतिना ।छिन्दन्नपि तदुद्धर्तुं नाशक्नोत् त्र्यम्बकस्तदा ॥ २२ ॥
ITRANS:
ākramyorasi dakṣasyaśita-dhāreṇa hetināchindann api tad uddhartuṁnāśaknot tryambakas tadā
Translation:
Then Vīrabhadra, the giantlike personality, sat on the chest of Dakṣa and tried to separate his head from his body with sharp weapons, but was unsuccessful.