“Ye are of your father the devil, and the lusts of your father ye will do. He was a murderer from the beginning, and abode not in the truth, because there is no truth in him. When he speaketh a lie, he speaketh of his own: for he is a liar, and the father of it.”
King James Version (KJV)
8:44 He was a murderer - In inclination, from the beginning - Of his becoming a devil; and abode not in the truth - Commencing murderer and liar at the same time. And certainly he was a killer of men (as the Greek word properly signifies) from the beginning of the world: for from the very creation he designed and contrived the ruin of men. When he speaketh a lie, he speaketh of his own - For he is the proper parent, and, as it were, creator of it. See the origin not only of lies, but of evil in general!
Joh 8:44 Ye are of [your] father, the devil. There are two households: that of God, composed of his children; and that of the devil, composed of his children. All who hear the voice of Christ become God's children by adoption (Ro 8:15-17), and all who refuse to hear him, do so because they belong to the devil's household and hear his voice. They "will do the lusts of their father". He was a murderer from the beginning. He caused the first murder, moves those who do murder, and those who seek to kill Christ are of his spirit.