At the climax of the battle, both Itachi and Sasuke run out of chakra. However, Sasuke reveals that his actions up until now were only a preparation for his final jutsu.
I can lend you power...
...أستطيعُ منحك القوّة
Te puedo prestar mi poder...
Te puedo prestar mi poder.
Posso darti altra forza...
Eu posso te emprestar poder...
Дать тебе своей силы...