Mahabharata 12.63.23

न चैतन्नैष्ठिकं कर्म त्रयाणां भरतर्षभचतुर्णां राजशार्दूल प्राहुराश्रमवासिनाम्

na caitannaiṣṭhikaṃ karma trayāṇāṃ bharatarṣabhacaturṇāṃ rājaśārdūla prāhurāśramavāsinām

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