I'll give it back to you
Te debo dinero, en cuanto reciba el primer salario te lo devuelvo.
I owe you money, I'll pay you back as soon as I receive my first salary.
— Moscú no cree en las lágrimas (1980)
Claro, no hay problema, te lo devuelvo mañana sin falta.
Sure, no problem, I'll give it back to you tomorrow without fail.
I'll return it to you in a few days.
— Juego sucio (Infernal Affairs) (2002)
I'll give it back to you.