Mahabharata 12.232.26

शून्या गिरिगुहाश्चैव देवतायतनानि चशून्यागाराणि चैकाग्रो निवासार्थमुपक्रमेत्

śūnyā giriguhāścaiva devatāyatanāni caśūnyāgārāṇi caikāgro nivāsārthamupakramet

Our plain-language meaning of this verse is waiting for scholar review.