Mbh 13.84.4b

Neither the goddess Earth, nor the Firmament, nor Heaven, O puissant one, nor all of them together, will be able to bear thy energy, we firmly believe. The entire universe is certain to be burnt through the force of thy energy. It behoveth thee, O puissant one, to show us favour, O illustrious deity. That favour consists in thy not begetting a son, O foremost of the deities, upon the goddess Uma. Do thou, with patience, restrain thy fiery and puissant energy!" Unto the deities that said so the holy Mahadeva having the bull for his sign, O regenerate Rishi, answered, saying, "So be it!" Having said so, the deity that has the bull for his vehicle, drew up his vital seed. From that time he came to be called by the name of Urdhvaretas (one that has drawn up the vital seed). The spouse of Rudra, however, at this endeavour of the deities to stop procreation, became highly incensed. In consequence of her being of the opposite sex (and, therefore, endued with little control upon her temper) she used harsh words, thus, "Since ye have opposed my lord in the matter of procreating a child when he was desirous of procreating one upon me, as the consequence of this act, ye deities, ye all shall become sonless. Verily, since ye have opposed the birth of issue from me, therefore, ye shall have no offspring of your own." At the time this curse was denounced, O perpetuator of Bhrigu's race, the deity of fire was not there. It is in consequence of this curse of the goddess that the deities have become childless. Rudra, solicited by them, held in himself his energy of incomparable puissance. A small quantity, however, that came out of his body fell down on the earth. That seed, falling on the earth, leaped into a blazing fire and there began to grow (in size and power) most wonderfully. The energy of Rudra, coming in contact with another energy of great puissance, became identified with it in respect of essence.