Valmiki Ramayana Yuddha Kanda Sarga 49 Shloka 19
Original Shlokaसुरुष्टेनापिवीरेणलक्ष्मणेननसंस्मरे । परुषंविप्रियंवापिश्रावितंनकदाचन ।।6.49.19।।
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सुरुष्टेनापि even unpalatable, वीरेण heroic, लक्ष्मणेनवापि by Lakshmana, कदाचन indeed, परुषम् harsh, विप्रियम् deeply, श्रावितम् invoked, नसंस्मरे I do not remember.
"Indeed, heroic Lakshmana never uttered an unpalatable word. I do not remember him speaking harsh words even when he was deeply provoked."