Skandapurana 2.3.6.110

2.3.6.110

giridarīnilaye nivasatyamī ṛṣigaṇāḥ phalamūlajalāśanāḥ ..

These hosts of seers reside in the mountain-cave abode, subsisting on fruits, roots, and water, / having conquered the mind and sensory objects, of sharpened intellect, as though anxious about the fear of sin out of fear of the Kali age. (52)