“Despite widespread use of the phrase immortal soul, this terminology is found nowhere in the Bible. Where did the idea of an immortal soul originate?
“See to it that no one takes you captive through philosophy and empty deception, according to the tradition of men, according to the elementary principles of the world, rather than according to Christ.” (Col. 2:8)
For more information about the study in the Bible about immortality, see the page called "Immortality - a gift or a given?" under the heading of Studies.