Mahabharata 3.82.107

अभिगम्य त्रिलोकेशं वरदं विष्णुमव्ययम्अश्वमेधमवाप्नोति विष्णुलोकं च गच्छति

abhigamya trilokeśaṃ varadaṃ viṣṇumavyayamaśvamedhamavāpnoti viṣṇulokaṃ ca gacchati

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