Mbh 10.17.5

"'After the creatures had multiplied and the Grandsire had become well pleased, the first-born rose from the water and beheld the living creation. He saw that diverse kinds of creatures had been created and that they had multiplied by their own energy. At this sight, Rudra became angry and caused his procreative limb to disappear in the bowels of the Earth. The unfading Brahma, soothing him by soft words, said unto him, "O Sharva, what wert thou doing so long within the water? For what reason, also hast thou caused thy limb of generation to disappear in the bowels of the Earth?" Thus questioned, that lord of the universe wrathfully answered the lord Brahman, "Somebody else has created all these creatures! What purpose then would be served by this limb of mine? I have by my austerities, O Grandsire, created food for all these creatures. These herbs and plants also will multiply like those that will subsist upon them!" Having said these words, Bhava went away, in cheerlessness and rage, to the foot of the Menjavat mountains for practising severer austerities.'"