Valmiki Ramayana Aranya Kanda Sarga 28 Shloka 24

क्रुद्धः enraged, मर्मज्ञः one who knows the tender parts of the body, खरः Khara, युधि in war, तं रामम् that Rama, चतुर्भिः four, मार्गणैः with arrows, मातङ्गम् elephant, तोमरैरिव like with a javelin, गात्रेषु on his limbs, विव्याध hit.

Quite enraged, Khara who knew how to hit the tender parts (of the body) in an encounter sent out four arrows on Rama. It was like poking an elephant's limbs with a javelin.