PURPORT

As stated in Bhagavad-gita, the performance of yajna brings reciprocal good fortune for both the human beings and the demigods. When the performances of yajna were stopped by the disturbances of the demons, the demigods were naturally bereft of the results of yajna 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.