Valmiki Ramayana Yuddha Kanda Sarga 14 Shloka 11

हस्त: Prahastha, मया: by me, त्वयाच: and by you, सर्वैः all, राक्षसैर्वा: by Rakshasas also, अर्थविशारदस्य: one who is knowledgeable of everything, रामस्य: Rama's, वधः killing, अप्लवस्य: not swimming, महार्णवम् great ocean, तर्तुम् इव: like crossing, कथम् how, भवेत् will it be possible.

"Prahastha How can you or me or all Rakshasas kill Rama who is knowledgeable of everything, just as one who is not swimming can cross the great ocean."