Mahabharata 14.70.16

अश्वमेधो हि राजेन्द्र पावनः सर्वपाप्मनाम्तेनेष्ट्वा त्वं विपाप्मा वै भविता नात्र संशयः

aśvamedho hi rājendra pāvanaḥ sarvapāpmanāmteneṣṭvā tvaṃ vipāpmā vai bhavitā nātra saṃśayaḥ

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