Kansa informed by Nārada of the existence of Krishna and Balarāma; he sends Kesin to destroy them and Akrura to bring them to Mathura - Verse 5
Vishnu Purana (GRETIL; M. M. Pathak critical edition) · 4 · Verse 15.5
Sanskrit Original
निरतिशयपुण्यजातसमुद्भूतम एतत सत्त्वम इति रजोद्रेकप्रेरितैकाग्रमतिस तद्भावनायोगात ततो ऽवाप्तवधहैतुकीं निरतिशयाम एवाखिलत्रैलोक्याधिक्यधारिणीं दशाननत्वे भोगसंपदम अवाप।।
niratiśayapuṇyajātasamudbhūtam etat sattvam iti rajodrekapreritaikāgramatis tadbhāvanāyogāt tato 'vāptavadhahaitukīṃ niratiśayām evākhilatrailokyādhikyadhāriṇīṃ daśānanatve bhogasaṃpadam avāpa||
This essence, born from immense merit, is called sattva, which is inspired by the predominance of rajas and focused through meditation. From this, one attains the ultimate cause of liberation, which is the supreme wealth of all three worlds, manifesting in the form of the ten-headed one.