evam viprakrte loke
divam devah parityajya
bhuvi cerur alaksitah
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Thus disturbed again and again by the unnatural occurrences caused by the followers of Hiranyakasipu, all the people had to cease the activities of Vedic culture. Not receiving the results of yajña, the demigods also became disturbed. They left their residential quarters in the heavenly planets and, unobserved by the demons, began wandering on the planet earth to see the disasters.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
As stated in Bhagavad-gita, the performance of yajña brings reciprocal good fortune for both the human beings and the demigods. When the performances of yajña were stopped by the disturbances of the demons, the demigods were naturally bereft of the results of yajña and hampered in executing their respective duties. Therefore they came down to the planet earth to see how people had become disturbed and to consider what to do.