Mahabharata 12.87.4

षड्विधं दुर्गमास्थाय पुराण्यथ निवेशयेत्सर्वसंपत्प्रधानं यद्बाहुल्यं वापि संभवेत्

ṣaḍvidhaṃ durgamāsthāya purāṇyatha niveśayetsarvasaṃpatpradhānaṃ yadbāhulyaṃ vāpi saṃbhavet

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