Rig Veda
दू॒णाशं॑ स॒ख्यं तव॒ गौर॑सि वीर गव्य॒ते । अश्वो॑ अश्वाय॒ते भ॑व ॥ दूणाशं सख्यं तव गौरसि वीर गव्यते । अश्वो अश्वायते भव ॥
Your friendship, Indra, is not easily lost; you, hero are (the giver of) cattle to him who desires cattle (of) horses him who desires horses.
english translation