Srimad-Bhagavatam: Canto 10 - Chapter 1 - Verse 35
Sanskrit:
हत्वा कंसं रङ्गमध्ये प्रतीपं सर्वसात्वताम् ।यदाह व: समागत्य कृष्ण: सत्यं करोति तत् ॥ ३५ ॥
ITRANS:
hatvā kaṁsaṁ raṅga-madhyepratīpaṁ sarva-sātvatāmyad āha vaḥ samāgatyakṛṣṇaḥ satyaṁ karoti tat
Translation:
Having killed Kaṁsa, the enemy of all the Yadus, in the wrestling arena, Kṛṣṇa will now surely fulfill His promise to you by coming back.