Mahabharata 1.110.14

वास्यैकं तक्षतो बाहुं चन्दनेनैकमुक्षतःनाकल्याणं न कल्याणं प्रध्यायन्नुभयोस्तयोः

vāsyaikaṃ takṣato bāhuṃ candanenaikamukṣataḥnākalyāṇaṃ na kalyāṇaṃ pradhyāyannubhayostayoḥ

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