Valmiki Ramayana Aranya Kanda Sarga 36 Shloka 20

ततः then, तयोः both (Rama and Lakshmana), अपाये तु in their absence, शून्ये in an isolated place, यथासुखम् with ease, निराबाधः without any impediment, सीताम् Sita, राहुः Rahu, चन्द्रप्रभामिव like the lustre of the Moon, हरिष्यामि I will abduct.

Then during their absence it will be easy for me to abduct Sita in an isolated place without obstruction, like Rahu eclipsing the light of the moon.