Mahabharata 13.120.3

व्यास उवाच · vyāsa uvāca

क्षात्रं चैव व्रतं कीट भूतानां परिपालनम्क्षात्रं चैव व्रतं ध्यायंस्ततो विप्रत्वमेष्यसि

kṣātraṃ caiva vrataṃ kīṭa bhūtānāṃ paripālanamkṣātraṃ caiva vrataṃ dhyāyaṃstato vipratvameṣyasi

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