Valmiki Ramayana Ayodhya Kanda Sarga 44 Shloka 26
Original Shlokaनार्हा त्वं शोचितुं देवि यस्यास्ते राघवस्सुतः। न हि रामात्परो लोके विद्यते सत्पथे स्थितः।।2.44.26।।
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देवि O Kausalya, यस्याः whose, ते to you, राघवः Rama, सुतः as son, त्वम् you, शोचितुम् to grieve, नार्हा are not fit, रामात् compared to Rama, परः superior, सत्पथे on the path of virtue, स्थितः abiding, लोके in this world, न विद्यते हि is not found.
O Kausalya, with a son like Rama, you should not grieve. There is none in this world superior to Rama who stands steady in the path of virtue.