Mahabharata 3.69.17

बृहदश्व उवाच · bṛhadaśva uvāca

ततः सदश्वांश्चतुरः कुलशीलसमन्वितान्योजयामास कुशलो जवयुक्तान्रथे नरः

tataḥ sadaśvāṃścaturaḥ kulaśīlasamanvitānyojayāmāsa kuśalo javayuktānrathe naraḥ

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