Mahabharata 4.47.18

4.47.18

ācāryo madhyatastiṣṭhatvaśvatthāmā tu savyataḥ |
kṛpaḥ śāradvato dhīmānpārśvaṃ rakṣatu dakṣiṇam || 18 ||

"Vaisampayana continued, 'These words spoken by the high-souled [paragraph continues] Bhishma were acceptable to them, and the king of the Kauravas acted accordingly without delay. And having sent away the king and then the kine, Bhishma began to array the soldiers in order of battle. And addressing the preceptor, he said, 'O preceptor, stand thou in the centre, and let Aswatthaman stand on the left, and let the wise Kripa, son of Saradwata, defend the right wing, and let Karna of the Suta caste, clad in mail, stand in the van. I will stand in the rear of the whole army, protecting it from that point.'"