Mahabharata 12.27.18

अघातयं च यत्कर्णं समरेष्वपलायिनम्ज्येष्ठं भ्रातरमत्युग्रं को मत्तः पापकृत्तमः

aghātayaṃ ca yatkarṇaṃ samareṣvapalāyinamjyeṣṭhaṃ bhrātaramatyugraṃ ko mattaḥ pāpakṛttamaḥ

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