Srimad-Bhagavatam: Canto 10 - Chapter 1 - Verse 11
Sanskrit:
गृहीत्वा शृङ्गयोस्तं वा अष्टादश पदानि स: ।प्रत्यपोवाह भगवान् गज: प्रतिगजं यथा ॥ ११ ॥
ITRANS:
gṛhītvā śṛṅgayos taṁ vāaṣṭādaśa padāni saḥpratyapovāha bhagavāngajaḥ prati-gajaṁ yathā
Translation:
The Supreme Lord Kṛṣṇa seized Ariṣṭāsura by the horns and threw him back eighteen steps, just as an elephant might do when fighting a rival elephant.