Kansa was under the impression that he had destroyed Devaki's children, but this was not the case. The children that were handed over to him were children of Hiranyakasipu, whom Vishnu slew as the Man-Lion, who were brought from the nether regions by Yoganindra, "the great illusory energy of Vishnu," and lodged in Devaki's womb in order that the cruel Kansa might be overreached. Vishnu said to this goddess: "Go, Nidra (Sleep), to the nether regions, and by my command conduct successively six of their princes to be conceived by Devaki. When these shall have been put to death by Kansa, the seventh conception shall be formed of a portion of Sesha (the serpent-deity), who is part of me; and this
you shall transfer before the time of birth to Rohini, another wife of Vasudeva, who resides at Gokula." This child was Balarama. "The report shall run that Devaki miscarries. I will myself become incarnate in her eighth conception; and you shall take a similar character as the embryo offspring of Yasoda, the wife of a herdsman named Nanda. In the night of the eighth of the dark half of the month Nabhas I shall be born; and you will be born on the ninth. Impelled and aided by my power, Vasudeva shall bear me to the bed of Yasoda, and you to the bed of Devaki. Kansa shall take you and hold you up to dash you against a stone; but you shall escape into the sky, where Indra shall meet and do homage to you through reverence of me."
When Devaki gives birth to her eighth son, Vasudeva takes the child, and, eluding the vigilance of the guards, hurries through the city, with the serpent Sesha following. On reaching the river Yamuna, which he has to cross, though ordinarily both wide and deep, it assists him in his flight, the water only rising to his knees. Just as he reaches Nanda's house, Yasoda had given birth to her child, which Vasudeva seizes, and, leaving Devaki's child in its place, returns to his prison home, and manages to re-enter unobserved. Soon after this the cry of the new-born child being heard by the guard, Kansa is quickly informed of its birth, and, rushing into the room, seized and dashed it against a stone. But fate was too strong for him. Immediately the child touched the ground, "it rose into the sky, and, expanding into a gigantic figure, having eight arms, each wielding some formidable weapon, laughed and said to Kansa, 'What avails it thee to have hurled me to the ground? He is born that shall kill thee, the mighty one amongst the
gods, who was formerly thy destroyer.'" The reference of the last sentence as taught by other Puranas is to the fact that Kansa was no other than Kalanemi, whom Vishnu had slain when incarnate as Rama.