Ramayana
तपश्चरणयुक्तस्य श्रम्यमाणेन्द्रियस्य ते । शुश्रूषणपरा नित्यं भविष्यति न संशयः ॥ 7-2-26 ॥
"For you who are engaged in the practice of austerities, whose senses grow weary, she will ever be devoted to your service—of this there is no doubt."
english translation