Śrī Śukadeva Gosvāmī said: Lord Śrī Kṛṣṇa, accompanied by Balarāma and surrounded by the Yadu dynasty, executed the killing of many demons. Then, further to remove the burden of the earth, the Lord arranged for the great Battle of Kurukṣetra, which suddenly erupted in violence between the Kurus and the Pāṇḍavas.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
श्रीबादरायणिरुवाच । कृत्वा दैत्यवधं कृष्णः सरामो यदुभिर्वृतः । भुवोऽवतारयद्भारं जविष्ठं जनयन् कलिम्
śrībādarāyaṇiruvāca | kṛtvā daityavadhaṃ kṛṣṇaḥ sarāmo yadubhirvṛtaḥ | bhuvo'vatārayadbhāraṃ javiṣṭhaṃ janayan kalim
SB 11.1.1