'Well then, let me know this from you, Sir,' said Dâlbhya. 'Know it,' replied Silaka Sâlâvatya. 'What is the origin of that world (heaven)?' 'This world,' he replied. 'And what is the origin of this world?'— He replied: 'Let no man carry the Sâman beyond this world as its rest. We place the Sâman in this world as its rest, for the Sâman is extolled as rest.'

In plain words: Dalbhya humbly asked Silaka to teach him. Silaka said heaven comes from this world, and that the chant rests on this world, so the questioning should stop there.