Ramayana
वज्रप्रहारानचला यथा घोरान्विषेहिरे । गदाप्रहारांस्तौ तत्र सेहाते नरराक्षसौ ॥ 7-32-54 ॥
As mountains endure the fearsome blows of the thunderbolt, so did those two, the man and the rakshasa, withstand there the blows of each other's maces.
english translation