Ramayana
ब्रह्मर्षिस्त्वेवमुक्तो ऽसौ विश्रवा मुनिपुङ्गवः । प्राञ्जलिं धनदं प्राह शृणु पुत्र वचो मम ॥ 7-11-37 ॥
Thus addressed, that brahmin sage Vishrava, the foremost of munis, said to the bestower of wealth (Kubera), who stood with palms joined: "Hear my words, my son."
english translation