Valmiki Ramayana Sundara Kanda Sarga 59 Shloka 18
Original Shlokaपितामहवरोत्सेकात्परमं दर्पमास्थितौ। अमृतप्राशिनावेतौ सर्ववानरसत्तमौ।।5.59.18।।
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पितामहवरोत्सेकात् by virtue of the boons received from Brahma, परमम् very, दर्पम् proud, आस्थितौ filled with, एतौ both of them that way, वानरसत्तमौ foremost of vanaras, अमृतप्राशिनौ have consumed nectar of immortality.
"By virtue of the boons received from Brahma, they are very proud. They have also consumed nectar of immortality and are foremost among vanaras.