Śānti-parva Adhyāya 3: Karṇa’s training under Rāma Jāmadagnya and the Bhārgava restriction on the Brahmāstra
स तस्योरुमथासाद्य बिभेद रुधिराशन: । न चैनमशकत् क्षेप्तुं हन्तुं वापि गुरोर्भयात्
sa tasyorum athāsādya bibheda rudhirāśanaḥ | na cainam aśakat kṣeptuṁ hantuṁ vāpi guror bhayāt ||
Having reached his thigh, the blood-eater tore it open. Yet, out of fear and reverence for his teacher, he could neither cast him away nor kill him.
नारद उवाच