Who said "Kill them before they kill you."?

This quote is attributed to Rick Deckard.

Kill them before they kill you. - Rick Deckard

"Kill them before they kill you."

Rick Deckard Fear

Character in Do Androids Dream of Electric Sheep?

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"It can't last."

"I'm not a replicant. I'm a human being."

"What is human? What separates us from machines?"

"I am alive and they are not."

"Face your fears with courage."

"You can't live your life in fear."

"Snakes. Why'd it have to be snakes?"

"Fear is just another obstacle to overcome."