Bhagavatapurana 1.7.18

1.7.18

tam āpatantaṃ sa vilakṣya dūrāt kumārahodvignamanā rathena /
parādravat prāṇaparīpsururvyāṃ yāvadgamaṃ rudrabhayādyathā kaḥ //

18. Seeing from a distance that Arjuna was in pursuit of him (Asvatthaman), the slayer of children, with a perplexed heart, anxious to save his life, took to flight in a chariot (and ran) as far as he could go on the earth, even as Brahma ran for fear of Rudra.