Valmiki Ramayana Kishkindha Kanda Sarga 30 Shloka 78
Original Shlokaवर्षासमयकालं तु प्रतिज्ञाय हरीश्वरः। व्यतीतांश्चतुरो मासान्विहरन्नावबुध्यते4.30.78।।
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हरीश्वरः Sugriva, वर्षासमयकालम् in the rainy season, प्रतिज्ञाय having sworn, विहरन् revelling, व्यतीतान् spent, चतुरः four, मासान् months, नावबुध्यते he is not aware.
'Having promised (to search for Sita) after the rainy season,Sugriva is not aware that he has (already) spent the four monthsrevelling.