Bhagavad Gita 1.20

Then, upon beholding the sons of Dhritarashtra, drawn up on the battlefield, ready to fight, Arjuna, whose flag bore the image of Hanuman,

अथ व्यवस्थितान् दृष्ट्वा धार्तराष्ट्रान्कपिध्वजः।
प्रवृत्ते शस्त्रसंपाते धनुरुद्यम्य पाण्डवः॥

atha vyavasthitān dṛṣṭvā dhārtarāṣṭrānkapidhvajaḥ|
pravṛtte śastrasaṃpāte dhanurudyamya pāṇḍavaḥ||

English translation (above): Shri Purohit Swami (1935), public domain. Sanskrit text via github.com/gita/gita (Unlicense).