The story of Kubja occurs in Shrimadbhagavatha. Kubja was a maid servant in Mathura with the responsibility of procuring sandalwood paste and perfumed oils to the royal court of the tyrannical ruler, Kamsa. She was hunchbacked and perhaps a dwarf, also known by the name of Trivakra (crooked at three spots on her body).
When Krishna and Balarama arrived at Mathura for the first time, at the wicked invitation of his uncle to participate in a wrestling competition, she lovingly offered sandalwood paste to both of them.
Krishna was pleased by this act of hers. Out of brimming love and kindness, he held her toes pressed to the ground with his own toes, and gently lifted her chin upwards with his fingers. All her bodily crookedness vanished at once, and she stood upright as a beautiful damsel.
Krishna also offered her a boon in return for her service. She, in turn, appealed to Krishna to come to her home. Krishna promised her that he would do so once his mission in Mathura was accomplished, and he kept his promise
