BATTY: I’ve seen things you people wouldn’t believe. Attack ships on fire off the shoulder of Orion. I watched C-beams glitter in the dark near the Tannhauser Gate. All those moments will be lost in time, like tears in rain. Time to die.

David Peoples (b. 1940) American screenwriter

Blade Runner (1982) [screenplay with Hampton Fancher]
    (Source)

(Source (Video); dialog confirmed)

Roy Batty was played by Rutger Hauer. These lines are not in Philip K. Dick's source story, Do Androids Dream of Electric Sheep? (1968).