Kansa Vadha, Killing of demon Kansa by Lord Krishna, is also mentioned in Padma Purana. Kansa was the maternal uncle of Sri Krishna.
Continuing with the divine tales of Sri Krishna, Lord Mahadeva told Parvati–When Kansa failed in his repeated attempts to kill Sri Krishna, he instructed ‘Akrura’ to invite both Krishna and Balarama to Mathura on the pretext of attending a ceremony called Dhanush-yagya. Kansa had planned to kill Sri Krishna by deceitful means. Akrura was a great devotee of Sri Krishna and was aware of Kansa’s evil intentions. But, he had no other option but to follow the command of his master Kansa. So, Akrura went to Vraja where Sri Krishna and Balarama used to live.
Sri Krishna and Balarama were delighted to meet Akrura. After the formal exchange of pleasantaries, Krishna took Akrura to his home. Akrura conveyed the instructions of Kansa to Nanda and requested him to send both Sri Krishna and Balarama to Mathura. Akrura said–‘Sri Krishna is the incarnation of Lord Vishnu and Kansa will be killed by him.’Nanda and Yashoda were reluctant to send Sri Krishna to Mathura but Sri Krishna convinced them, Ultimately. Akrura returned to Mathura accompanied by Krishna and Balarama. The people of Vraja became sad when the time for Krishna’s departure to Mathura arrived.
When Akrura reached Mathura accompanied by Sri Krishna and Balarama it was already evening. Sri Krishna saw a dyer with colourful apparels going towards Kansa’s palace. Sri Krishna playfully demanded some set of clothes from that dyer which he refused to give. Sri Krishna was infuriated and slapped him so hard that he started vomiting blood. In a short time the dyer was dead. Sri Krishna and Balarama chose some beautiful set of clothes for themselves
and proceeded towards the palace of Kansa. After sometime they met a crooked woman carrying ‘sandal-wood-paste’. Sri Krishna demanded some sandal wood paste from her, which she gave without any hesitation. Sri Krishna blessed that crooked woman as a result of which she was cured of her physical–deformity.
At last, both Sri Krishna and Balarama reached the oblation–site where ‘Dhanush-yagya’ was suppossed to be performed. Sri Krishna lifted the divine bow kept there and broke it into two pieces. When Kansa learnt that the divine bow had been broken, he ordered Chanura to kill Krishna in a wrestling-bout. Kansa also fortified his palace by positioning wild elephants and mighty warriors at all the entrance-points. Sri Krishna and Balarama spent the night at the oblation-site. In the morning both of them proceeded towards the palace. Sri Krishna found an elephant named Kuvalyapeeda standing at the main entrance of the palace. He killed that ferocious elephant without much difficulty.
Sri Krishna and Balarama then entered the gymnasium where wrestling-bouts were supposed to take place. All the demons those who had witnessed Sri Krishna killing that huge elephant without any problem, became terrified and fled away from the gymnasium. Sri Krishna and Balarama entered the chamber of Kansa.
Kansa became terrified and ordered his trusted lieutenants – – Chanura and Mushtika to kill Krishna. Chanura confronted Sri Krishna while Mushtik fought a duel with Balarama. Ultimately, both the demons were killed after a fierce duel. Now, Kansa was left all alone, Sri Krishna pulled Kansa from the throne where he was sitting and slapped him so hard that he fell down on the ground. The injury proved to be fatal and as a result Kansa died. Balarama also killed Kansa’s younger brother whose named was Sunama.
After killing Kansa, Krishna and Balarama went to meet their parents–Vasudev and Devaki. They also freed their maternal grandfather- Ugrasena who had been imprisioned by Kansa. At last they appointed Ugrasena as the king of Mathura.