Valmiki Ramayana Sundara Kanda Sarga 13 Shloka 37
Original Shlokaघोरमारोदनं मन्ये गते मयि भविष्यति।।5.13.37।। इक्ष्वाकुकुलनाशश्च नाशश्चैव वनौकसाम्।
1 source checked for this shloka
मयि गते when I go, इक्ष्वाकुकुलनाशश्च destruction of the Ikshvakus, वनौकसाम् of vanaras, नाशश्चैव destruction, घोरम् dreadful, आरोदनम् weeping, भविष्यति will be, मन्ये I think.
"If I go there (without finding Sita), it will cause destruction of the Ikshvakus and vanaras would weep. It would be dreadful.