Mbh 5.102.1b

Those waters, O Matali, that yielded these precious things had all been mixed with the milk of these four cows. As regards Surabhi, the milk she yielded becometh Swaha unto those that live on Swaha, Swadha unto those that live on Swadha, and Amrita unto those that live on Amrita. The couplet that was sung by the dwellers of Rasatala in days of old, is still heard to be recited in the world by the persons of learning. That couplet is this,--Neither in the region of the Nagas, nor in Swarga, nor in Vimana, nor in Tripishtapa is residence so happy as in Rasatala!”’”