Valmiki Ramayana Kishkindha Kanda Sarga 62 Shloka 8
Original Shlokaपरमान्नंतु वैदेह्या ज्ञात्वा दास्यति वा सः। यदन्नममृतप्रख्यं सुराणामपिदुर्लभम्4.62.8।।
1 source checked for this shloka
सुराणाम् of gods, वैदेह्या by Sita, दास्यति avoiding to eat, ज्ञात्वा knowing, वा to, स: he, परमान्नंतु divine food, यदन्नम् as food, अमृतप्रख्यम् like nectar, अपिदुर्लभं that which is difficult to get.
'Knowing that Vaidehi is not eating food(given by Ravana) Indra,the ruler of gods, will offer nectarlike food rare even for gods.