Valmiki Ramayana Ayodhya Kanda Sarga 38 Shloka 3
Original Shlokaस निःश्वस्योष्णमैक्ष्वाक स्तां भार्यामिदमब्रवीत्। कैकेयि कुशचीरेण न सीता गन्तुमर्हति।।2.38.3।।
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सः ऐक्ष्वाकः that descendant of the Ikshvakus (Dasaratha), उष्णम् निःश्वस्य heaving hot sighs, भार्याम् to his wife (Kaikeyi), इदम् these words, अब्रवीत् he spoke, कैकेयी O Kaikeyi, सीता Sita, कुशचीरेण with kusa garment, गन्तुम् to go, नार्हति is not worthy of.
The descendant of the Ikshvakus (Dasaratha), heaving hot sighs, said to his wife O Kaikeyi, Sita does not deserve to go (to the forest) in garment of kusa grass.