Valmiki Ramayana Kishkindha Kanda Sarga 12 Shloka 37

वानर monkey, तस्मात् therefore, त्वम् you, भूयः again go, युध्यस्व fight, मा मा do not do not, शङ्केश्च you may doubt me, एतन्मुहूर्ते in one moment, मया by me, आहवे in war, एकेन by a single, बाणेन by arrow, निरस्तम् thrown down, महीतले on the ground, वेष्टमानम् rolling, वालिनम् Vali, पश्य see.

'Therefore, O monkey, go and engage yourself in fight again. Do not suspect me. With this single arrow of mine, in one moment you will see Vali thrown down and rolling on the ground in this combat.