Canto 3 -
Araṇya-kāṇḍa
Chapter 70: The Fall of Kabandha
Text 3.70.9

दक्षिणो दक्षिणं बाहुमसक्तमसिना ततः।
चिच्छेद रामो वेगेन सव्यं वीरस्तु लक्ष्मणः॥

dakṣiṇo dakṣiṇaṁ bāhum asaktam asinā tataḥ
ciccheda rāmo vegena savyaṁ vīras tu lakṣmaṇaḥ

dakṣiṇaḥ = capable; dakṣiṇam = the right; bāhum = arm; asaktam = freely; asinā = with His sword; tataḥ ciccheda = cut off; rāmaḥ = Rāma; vegena = and forcefully; savyam = [cut off] the left [arm]; vīraḥ = heroic; tu = while; lakṣmaṇaḥ = Lakṣmaṇa.

Capable Rāma freely and forcefully cut off the right arm with His sword while heroic Lakṣmaṇa [cut off] the left [arm].