tasya medhyam hayam devah
prakrtya-by nature; visama-not level; devi-the earth; krta-was made; tena-by him; sama-level; katham-how; tasya-his; medhyam-meant for offering in the sacrifice; hayam-horse; devah-the demigod Indra; kasya-for what; hetoh-reason; apaharat-stole.