Mahabharata 1.91.2

सोऽश्वमेधसहस्रेण वाजपेयशतेन चतोषयामास देवेन्द्रं स्वर्गं लेभे ततः प्रभुः

so'śvamedhasahasreṇa vājapeyaśatena catoṣayāmāsa devendraṃ svargaṃ lebhe tataḥ prabhuḥ

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