Mahabharata 3.45.36

गिरिदुर्गेषु हि सदा देशेषु विषमेषु चवसन्ति राक्षसा रौद्रास्तेभ्यो रक्षेत्सदा भवान्

giridurgeṣu hi sadā deśeṣu viṣameṣu cavasanti rākṣasā raudrāstebhyo rakṣetsadā bhavān

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