Valmiki Ramayana Sundara Kanda Sarga 64 Shloka 25
Original Shlokaसमाश्वसिहि भद्रं ते दृष्टा देवी न संशयः। नागन्तुमिह शक्यं तैरतीते समये हि नः।।5.64.25।।
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समाश्वसिहि trust me, ते to you, भद्रम् auspicious, देवी queen, दृष्टा have seen, संशयः doubt, न not, नः us, समये time, अतीते exceeded, तैः they, इह here, आगन्तुम् to come, न शक्यम् not possible.
"Trust me, Rama. Be blessed. The vanaras have seen the divine lady. There is no doubt. It is not possible for them to come here after exceeding the time limit (in their search for Sita).