Mahabharata 12.56.23

मनुना चापि राजेन्द्र गीतौ श्लोकौ महात्मनाधर्मेषु स्वेषु कौरव्य हृदि तौ कर्तुमर्हसि

manunā cāpi rājendra gītau ślokau mahātmanādharmeṣu sveṣu kauravya hṛdi tau kartumarhasi

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