Valmiki Ramayana Yuddha Kanda Sarga 52 Shloka 16
Original Shlokaअन्येतुपरमसङ्कृक्रुद्धाराक्षसाभीमनिश्वना: । तलैरेवाभिधावन्तिवज्रस्पर्शसमैर्हरीन् ।।6.52.16।।
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भीमविक्रमाः of terrific valour, अन्ये others, राक्षसाः Rakshasas, परमसङ्कृक्रुद्धाः extremely enraged, वज्रस्पर्शसमैः of hard touch like diamond, तलैरेव with palms, हरीन् monkeys, अभिधावन्ति assailed.
Other Rakshasas of terrific valour, extremely enraged, hit the monkeys with their palms which were hard as diamond to touch.