Bhagavad Gita · 1.20

अथ व्यवस्थितान्दृष्ट्वा धार्तराष्ट्रान्कपिध्वजः।प्रवृत्ते शस्त्रसम्पाते धनुरुद्यम्य पाण्डवः।हृषीकेशं तदा वाक्यमिदमाह महीपते॥

atha vyavasthitān dṛṣhṭvā dhārtarāṣhṭrān kapi-dhvajaḥ pravṛtte śhastra-sampāte dhanur udyamya pāṇḍavaḥ hṛṣhīkeśhaṁ tadā vākyam idam āha mahī-pate

Then, seeing Dhritarashtra's sons standing ready and the clash of weapons about to begin, Arjuna, whose flag bore the emblem of Hanuman, raised his bow and spoke these words to Krishna.

— Bhagavad Gita 1.20

Source: Sacred-Texts.com (Sanskrit) + Bhagavad-Gita.io (translations)