Ramayana
कुम्भकर्णस्ततो यत्तो नित्यं धर्मपथे स्थितः । तताप ग्रीष्मकाले तु पञ्चाग्नीन्परितः स्थितः ॥ 7-10-3 ॥
Then Kumbhakarna, ever diligent and steadfast on the path of righteousness, performed austerity in the summer season, standing surrounded by the five fires.
english translation