Ramayana
एष प्राप्तो दशग्रीवो मम भ्राता महाबलः । सुरलोकजयाकाङ्क्षी साहाय्ये त्वां वृणोति च ॥ 7-25-47 ॥
This ten-necked one, my brother of great strength, has arrived; desiring to conquer the world of the gods, he chooses you for his ally.
english translation