Harry Potter and the Deathly Hallows
"Hide them all, then," he croaked. "Keep her – them – safe. Please."
"And what will you give me in return, Severus?"
"In – in return?" Snape gaped at Dumbledore, and Harry expected him to protest, but after a long moment he said, "Anything." (33.129-130)
"And his knowledge remained woefully incomplete, Harry! That which Voldemort does not value, he takes no trouble to comprehend. Of house-elves and children's tales, of love, loyalty, and innocence, Voldemort knows and understands nothing. Nothing." (35.26)
"Master of death, Harry, Master of Death! Was I better, ultimately, than Voldemort?"
"Of course you were," said Harry. "Of course – how can you ask that? You never killed if you could avoid it!"
"True, true," said Dumbledore, and he was like a child seeking reassurance. "Yet I to sought a way to conquer death, Harry."
"Not the way he did," said Harry. […] "Hallows, not Horcruxes."