In plain words
First of all he told them to kill the boys. Later, fearing that danger might come to him from the girls too, he went on having them killed as well. But who could harm Kṛṣṇa? Who could hold back His divine power? Kṛṣṇa's divine fame went on growing day by day. To put an end to Kṛṣṇa, Kaṃsa began sending demons who took on magic forms to Vrepalle. But every one of them was killed at Kṛṣṇa's hands. No one could understand Kṛṣṇa's divine power. As it is said, ‘Vināśakāle viparīta buddhiḥ’: perverse notions arose in Kaṃsa. He hatched a plot to bring Kṛṣṇa to the city of Mathurā by some means or other and kill Him. He planned a yajña and sent Akrūra, who was very dear to them, to Vrepalle, telling him to bring both Kṛṣṇa and Balarāma to Mathurā to see it.
Kṛṣṇa's grace to Kubjā
With Akrūra, Kṛṣṇa and Balarāma reached the city of Mathurā. Seeing their divinely beautiful forms, the people there were enchanted. “Kṛṣṇa! Save us from Kaṃsa's clutches,” they prayed. Before going to Kaṃsa, Kṛṣṇa and Balarāma took Kaṃsa's clothes from the washerman and put them on. A servant woman named Kubjā met them on her way, carrying many fragrant unguents for Kaṃsa. The moment she saw Kṛṣṇa, she sprinkled rose water on Him in a joy she could not contain. She smeared sandal paste on His body. She knew that Kṛṣṇa was God. “Kṛṣṇa! Today my good fortune has ripened. This must be the merit of who knows how many births, but today the good luck of serving You like this has come to me,” she said, overflowing with joy. Kṛṣṇa, pleased, pressed down both her feet with His foot, put His hand under her cheeks and drew her upward. Her hunch was gone and she became a beautiful woman. In this way Kṛṣṇa went on showing many wonderful līlās and freeing ever so many from their curses.
The slaying of Kaṃsa
Kaṃsa flew into a rage when he heard that Kṛṣṇa and Balarāma were going about wearing his clothes. Meanwhile Kubjā went to him: “My lord, no one can understand Kṛṣṇa's magic.