Mahabharata 1.217.18

1.217.18

mahatā meghajālena nānārūpeṇa vajrabhṛt |
ākāśaṃ samavastīrya pravavarṣa sureśvaraḥ || 18 ||

"Vaisampayana continued, 'Hearing these words of the gods, and himself beholding what Agni was doing, the slayer of Vritra set out for the protection of the forest of Khandava. And Vasava, the chief of the celestials soon covering the sky with masses of clouds of every kind began to shower upon the burning forest. Those masses of clouds by hundreds and thousands, commanded by Indra began to pour rain upon Khandava in showers thick as the flag-staffs of battle-cars. But the showers were all dried up in the sky itself by the heat of the fire and could not, therefore, reach the fire at all! Then the slayer of Namuchi, getting angry with Agni, collected huge masses of clouds and caused them to yield a heavy downpour. Then with the flames contending with those heavy showers, and with masses of clouds overhead, that forest, filled with smoke and flashes of lightning, became terrible to behold.'"