Srimad-Bhagavatam: Canto 10 - Chapter 1 - Verse 38

Sanskrit:

सर्वस्यान्तर्बहि:साक्षी कृत्यां माहेश्वरीं विभु: ।विज्ञाय तद्विघातार्थं पार्श्वस्थं चक्रमादिशत् ॥ ३८ ॥

ITRANS:

sarvasyāntar-bahiḥ-sākṣīkṛtyāṁ māheśvarīṁ vibhuḥvijñāya tad-vighātārthaṁpārśva-sthaṁ cakram ādiśat

Translation:

The almighty Lord, the internal and external witness of all, understood that the monster had been produced by Lord Śiva from the sacrificial fire. To defeat the demon, Kṛṣṇa dispatched His disc weapon, who was waiting at His side.

Purport:

Śrīla Viśvanātha Cakravartī comments that Lord Kṛṣṇa, playing the part of a king, was absorbed in a gambling match and did not want to be disturbed by such an insignificant matter as the attack of a fiery demon. So He simply dispatched His cakra weapon and ordered him to take the necessary steps.