While Kaṁsa, controlling the reins of the horses, was driving the chariot along the way, an unembodied voice addressed him, “You foolish rascal, the eighth child of the woman you are carrying will kill you!”
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
पथि प्रग्रहिणं कंसमाभाष्याहाशरीरवाक् । अस्यास्त्वामष्टमो गर्भो हन्ता यां वहसेऽबुध
pathi pragrahiṇaṃ kaṃsamābhāṣyāhāśarīravāk | asyāstvāmaṣṭamo garbho hantā yāṃ vahase'budha
SB 10.1.34