Valmiki Ramayana Ayodhya Kanda Sarga 52 Shloka 53
Original Shlokaइमे चापि हया वीर यदि ते वनवासिनः। परिचर्यां करिष्यन्ति प्राप्स्यन्ति परमां गतिम्।।2.52.53।।
1 source checked for this shloka
वीर O valiant one, इमे these, हयश्चापि horses also, वनवासिनः dwelling in the forest, ते to you, परिचर्याम् service, करिष्यन्ति if they do, यदि if so, परमाम् supreme, गतिम् state, प्राप्स्यन्ति will attain.
O valiant one, if these horses too could render services to you while you dwell in the forest, they would attain the supreme state.