How do we know that the serpent was Satan?


I have started reading my Bible consistently, and have a couple of questions: Why do people say that the serpent who tempted Eve was Satan? I don't see that anywhere. Maybe I missed something? Also, someone once told me that Abram and Sarai were half-siblings, but I can't seem to find that anywhere either. What do you think?


There are several passages that identify Satan being the serpent:

"So the great dragon was cast out, that serpent of old, called the Devil and Satan, who deceives the whole world; he was cast to the earth, and his angels were cast out with him" (Revelation 12:9).

"He laid hold of the dragon, that serpent of old, who is the Devil and Satan, and bound him for a thousand years" (Revelation 20:2).

"You are of your father the devil, and the desires of your father you want to do. He was a murderer from the beginning, and does not stand in the truth, because there is no truth in him. When he speaks a lie, he speaks from his own resources, for he is a liar and the father of it" (John 8:44).

In regards to Abraham and Sarah: "But indeed she is truly my sister. She is the daughter of my father, but not the daughter of my mother; and she became my wife" (Genesis 20:12).

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