Srimad-Bhagavatam: Canto 10 - Chapter 1 - Verse 21
Sanskrit:
इति क्षिप्त्वा शितैर्बाणैर्विरथीकृत्य पौण्ड्रकम् ।शिरोऽवृश्चद् रथाङ्गेन वज्रेणेन्द्रो यथा गिरे: ॥ २१ ॥
ITRANS:
iti kṣiptvā śitair bāṇairvirathī-kṛtya pauṇḍrakamśiro ’vṛścad rathāṅgenavajreṇendro yathā gireḥ
Translation:
Having thus derided Pauṇḍraka, Lord Kṛṣṇa destroyed his chariot with His sharp arrows. The Lord then cut off his head with the Sudarśana disc, just as Lord Indra lops off a mountain peak with his thunderbolt weapon.