Jesus said about Satan “…He was a murderer from the beginning and does not stand in the truth, because there is no truth in him. When he tells a lie, he speaks from his own nature, because he is a liar and the father of lies.” John 8:44 (CSB)
The devil is a murderer and a liar in essence. But he will not last forever. The Bible wants you to know that he is also a defeated foe. Jesus won the war at the cross and sin will not have the final victory!