Valmiki Ramayana Aranya Kanda Sarga 36 Shloka 15
Original Shlokaत्वया ह्यहं सहायेन पार्श्वस्थेन महाबल।।3.36.14।। भ्रातृभिश्च सुरान्युद्धे समग्रान्नाभिचिन्तये। तत्सहायो भव त्वं मे समर्थो ह्यसि राक्षस।।3.36.15।।
1 source checked for this shloka
महाबल of great strength, सहायेन come for help, पार्श्वस्थेन at my side, त्वया by you, भ्रातृभिश्च by brothers also, युद्धे in war, समग्रान् together, सुरान् gods, नाभिचिन्तये I do not care, राक्षस demon, तत् therefore, त्वम् you, मे to me, सहायः accomplice, भव be, समर्थः capable, असि हि you are,
You are mighty. I do not care to fight even the gods when you and my brothers are by my side. Therefore, O demon, be my accomplice. (I know) you are capable of that.