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The Uttara Purana of the Mahapurana
"Even if she doesn't want to, I will take Jambavati by force, even if I have to stay in the Jyotirvana for a long time." (370)
Jambavan, enraged, said, "I will devour you!" and sent the Maaksikalakshita Vidya to kill him. (371)
At that time, the Yakshmali, the Vidhyadhara king of Kinnarapura, the maternal uncle of Namikumar, was present. He destroyed the Vidya. (372)
Hearing that all his Vidya had been destroyed, Jambavan sent his son, Jambunama, with his army. When Jambunama arrived, Namikumar, fearing for his life, fled with his maternal uncle. What else can be the result of actions done without thought, but defeat? (373-374)
Narada, knowing all this, quickly went to Kamalodara (Krishna) and described the beauty of Jambavati. Hearing this, Krishna said, "I will forcibly take that Sati." With his army, he went to the forest near the Vijayardha mountain. Baldev was with him. (375-376)
Knowing that this task was very difficult, Krishna observed a fast and pondered at night, "Who will help me achieve this?" Look, even though he had conquered three worlds, Krishna's future seemed to be shattered there. But the merit of Krishna, the enemy of that Vidhyadhara king, was equally powerful. (377-378)
Yakshil, his younger brother from a previous birth, who had become a Maha Shukra in heaven through penance, came and said, "I give you these two Vidya. You should master them." Saying this, and showing him how to master them, he went to heaven. Krishna created a Ksheerasagara (ocean of milk) and sat on a serpent bed in it. He mastered the Vidya for four months, following the proper procedures. In the end, Baldev mastered the Simhavahiini Vidya and Krishna mastered the Garuda Vahini Vidya. (379-381)
Then, mounted on those Vidya, Krishna defeated Jambavan in battle and took his daughter, Jambavati. On returning home, he happily appointed her as the Mahadevi. (382)
Although the story of his previous birth was unclear, it became as clear as day to Jambavati when she heard it from the mouth of a special speaker. (383)