Mahabharata 3.255.43
युधिष्ठिर उवाच · yudhiṣṭhira uvāca
न हन्तव्यो महाबाहो दुरात्मापि स सैन्धवःदुःशलामभिसंस्मृत्य गान्धारीं च यशस्विनीम्
na hantavyo mahābāho durātmāpi sa saindhavaḥduḥśalāmabhisaṃsmṛtya gāndhārīṃ ca yaśasvinīm
Our plain-language meaning of this verse is waiting for scholar review.