Srimad-Bhagavatam: Canto 6 - Chapter 1 - Verse 31

Sanskrit:

अथ ते क्‍व गता: सिद्धाश्चत्वारश्चारुदर्शना: ।व्यामोचयन्नीयमानं बद्ध्वा पाशैरधो भुव: ॥ ३१ ॥

ITRANS:

atha te kva gatāḥ siddhāścatvāraś cāru-darśanāḥvyāmocayan nīyamānaṁbaddhvā pāśair adho bhuvaḥ

Translation:

And where have those four liberated and very beautiful persons gone who released me from arrest and saved me from being dragged down to the hellish regions?

Purport:

As we have learned from the descriptions in the Fifth Canto, the hellish planets are situated in the lower portions of this universe. Therefore they are called adho bhuvaḥ. Ajāmila could understand that the Yamadūtas had come from that region.