Mahabharata 5.55.4

5.55.4

tamapaśyāma saṃnaddhaṃ meghaṃ vidyutprabhaṃ yathā |
sa mantrānsamabhidhyāya hṛṣyamāṇo'bhyabhāṣata || 4 ||

"Sanjaya said, 'Yudhishthira, O king, is very cheerful in view of the battle. And so also are Bhimasena and Arjuna. The twins also are perfectly fearless. Desirous of making an experiment of the mantras (obtained by him). Vibhatsu, the son of Kunti, yoked his celestial car illuminating all the directions. Accoutred in mail, he looked like a mass of clouds charged with lightning. After reflecting for a while, he cheerfully addressed me, saying,--Behold, O Sanjaya, these preliminary signs. We will certainly conquer.' Indeed, what Vibhatsu said unto me appeared to me to be true.'