Mahabharata 5.138.10
पितृपक्षे हि ते पार्था मातृपक्षे च वृष्णयःद्वौ पक्षावभिजानीहि त्वमेतौ पुरुषर्षभ
pitṛpakṣe hi te pārthā mātṛpakṣe ca vṛṣṇayaḥdvau pakṣāvabhijānīhi tvametau puruṣarṣabha
Our plain-language meaning of this verse is waiting for scholar review.
Open in the book