Srimad-Bhagavatam: Canto 10 - Chapter 1 - Verse 45

Sanskrit:

एवं समयमाकर्ण्य बद्ध्वा परिकरं प्रभु: ।आत्मानं सप्तधा कृत्वा न्यगृह्णाल्ल‍ीलयैव तान् ॥ ४५ ॥

ITRANS:

evaṁ samayam ākarṇyabaddhvā parikaraṁ prabhuḥātmānaṁ saptadhā kṛtvānyagṛhṇāl līlayaiva tān

Translation:

Upon hearing these terms, the Lord tightened His clothing, expanded Himself into seven forms and easily subdued the bulls.

Purport:

According to Śrīla Śrīdhara Svāmī, Lord Kṛṣṇa expanded Himself into seven forms not only to playfully defeat the seven bulls but also to show Princess Satya that she would not have to compete with His other queens, since He could enjoy with all of them simultaneously.