Valmiki Ramayana Yuddha Kanda Sarga 67 Shloka 40
Original Shlokaयथाशुष्काण्यरण्यानिग्रीष्मेदहतिपावकः । तथावानरसैन्यानिकुम्बकर्णोविनिर्दहत् ।।6.67.40।।
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ग्रष्मे summer, शुष्काणि dried, अरण्यानि forest, पावकः fire god, यथा like that, दहति consumes, तथा that, सःकुम्बकर्णः Kumbhakarna, वानरसैन्यानि Vanara army, विनिर्दहत् consuming.
Just as fire god consumes dried forest in summer, Kumbhakarna was consuming the Vanara army.