Valmiki Ramayana Sundara Kanda Sarga 1 Shloka 142
Original Shlokaरामस्यैष हितायैव याति दाशरथेर्हरिः। सत्क्रियां कुर्वता तस्य तोषितोऽस्मि दृढं त्वया।।5.1.142।।
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एषः हरिः this vanara, दाशरथेः of the son of Dasaratha, रामस्य Rama's, पितायैव for his wellbeing only, याति going, तस्य his, सत्क्रियाम् honour, कुर्वता for doing, त्वया by you, दृढम् surely, तोषितः अस्मि I am pleased.
"The vanara has gone on a mission to help the son of Dasaratha. I am highly pleased with the service rendered to him.