Mahabharata 5.138.19

गृहीत्वा व्यजनं श्वेतं धर्मात्मा संशितव्रतःउपान्वारोहतु रथं कुन्तीपुत्रो युधिष्ठिरः

gṛhītvā vyajanaṃ śvetaṃ dharmātmā saṃśitavrataḥupānvārohatu rathaṃ kuntīputro yudhiṣṭhiraḥ

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