Mahabharata 3.220.8

3.220.8

tato brahmā mahāsenaṃ prajāpatirathābravīt |
abhigaccha mahādevaṃ pitaraṃ tripurārdanam || 8 ||

"Then Brahma, the lord of all creatures, said to Mahasena, 'Do thou go and visit thy father Mahadeva, the conqueror of Tripura. Rudra coalescing with Agni (the Fire-god) and Uma with Swaha have combined to make thee invincible for the well-being of all creatures. And the semen of the high-souled Rudra cast into the reproductive organ of Uma was thrown back upon this hill, and hence the twin Mujika and Minjika came into being. A portion of it fell into the Blood Sea, another portion, into the rays of the sun, another upon the earth and thus was it distributed in five portions. Learned men ought to remember that these thy various and fierce-looking followers living on the flesh of animals were produced from the semen'. 'Be it so,' so saying, the high-souled Mahasena with fatherly love, honoured his father Maheswara."