Mahabharata 4.42.23

अश्वानां हेषितं श्रुत्वा का प्रशंसा भवेत्परेस्थाने वापि व्रजन्तो वा सदा हेषन्ति वाजिनः

aśvānāṃ heṣitaṃ śrutvā kā praśaṃsā bhavetparesthāne vāpi vrajanto vā sadā heṣanti vājinaḥ

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