In plain words
Vasudeva gently laid the baby boy he had carried there beside Yaśodā, put the baby girl she had just then given birth to in his basket, and came straight back to the prison. Yet Vasudeva did not understand what he was doing. He carried out his duty in obedience to God's command, but “What am I doing? Why am I going?”: no such thought arose in his mind. No one can understand the story of God.
Wondrous are they; for the three worlds they are purifying; sickles to the creeper of worldly life; true friends; to the forest of the sages a springtime: such are the stories of Lord Viṣṇu.
Vasudeva went into the prison and laid the baby girl he had brought beside Devakī. The prison doors and the locks closed of themselves. At once the bell rang. The guards woke up. Hearing the news that Devakī Devī had given birth, Kaṃsa came to the prison in a great commotion. As was his habit, he tossed up with his left hand the baby Vasudeva handed him, and raised his sword to cut it down. That girl of Māyā stood still right there in the sky: ‘Kaṃsa! The one who will kill you is growing up in Vrepalle,’ she warned, and vanished. Seeing this strange event, Devakī Devī was struck with wonder. She came to have faith that Kṛṣṇa would surely be able to protect the people from Kaṃsa's clutches.
‘Vināśakāle viparīta buddhiḥ’
In Yaśodā's house Kṛṣṇa grew day by day like the moon of the bright fortnight, showing many kinds of līlās. Kaṃsa was afraid when he heard that the one able to kill him, born of Devakī's eighth conception, was growing up in Vrepalle. Unable to make out which was Devakī's son, he gave his men the order to kill all the infants born in Vrepalle.