Valmiki Ramayana Aranya Kanda Sarga 57 Shloka 20

वीर O great hero, मे to me, भूयिष्ठम् many, अशुभान्येव inauspicious omens only, यथा similarly, प्रादुर्भवन्ति got manifested, जनकात्मजा Sita, सर्वथा by all means, विनष्टा she is lost, वनचारिभिः by forsetrangers, राक्षसैः demons, भक्षिता वापि must have been eaten up, मे for me, संशयः doubt, नास्ति is not.

O heroic Lakshmana I see many inauspicious omens. I think Sita might have been lost or eaten away by the demons of the forest. There is no doubt about it.