The composition of human nature:
The fleshly body;
The soul;
The spirit (a power of the soul).
The Flesh
“and in the womb of a mother I was molded into flesh, within the period of ten months, compacted with blood, from the seed of a man and the pleasure of marriage” (Wis. 7:1-2)
Soul and Spirit
“Now may the God of peace Himself sanctify you completely; and may your whole spirit, soul, and body be preserved blameless at the coming of our Lord Jesus Christ” (1 Thess. 5:23)
“But his flesh will be in pain over it, and his soul will mourn over it” (Job. 14:22)
“O God, You are my God; early will I seek You; my soul thirsts for You; my flesh longs for You in a dry and thirsty land where there is no water” (Ps. 63:1)
“My soul longs, yes, even faints for the courts of the LORD; my heart and my flesh cry out for the living God” (Ps. 84:2)
“The merciful man does good for his own soul, but he who is cruel troubles his own flesh” (Prov. 11:17)
At a Person’s Death the Soul Is Separated from the Body
“And do not fear those who kill the body but cannot kill the soul” (Matt. 10:28) (Luke. 12:4)
“And in a window sat a certain young man named Eutychus, who was sinking into a deep sleep. He was overcome by sleep; and as Paul continued speaking, he fell down from the third story and was taken up dead. But Paul went down, fell on him, and embracing him said, ‘Do not trouble yourselves, for his life is in him’” (Act. 20:9-10)
In the Greek: ἡ γὰρ ψυχὴ αὐτοῦ ἐν αὐτῷ ἐστιν — “for his soul is in him”.
After Death a Person’s Flesh Decays, but the Soul Continues to Exist
“he, foreseeing this, spoke concerning the resurrection of the Christ, that His soul was not left in Hades, nor did His flesh see corruption” (Act. 2:31)
Quotes on the immortality of the human soul.
At the Resurrection a Person’s Own Former Flesh Is Restored, and the Soul Returns, Reuniting with Its Flesh
“For I know that my Redeemer lives, and He shall stand at last on the earth; and after my skin is destroyed, this I know, that in my flesh I shall see God, whom I shall see for myself, and my eyes shall behold, and not another. How my heart yearns within me!” (Job. 19:25-27)
In the Septuagint (Job. 19:26, LXX): ἀναστήσαι τὸ δέρμα μου — “may He raise up my skin”.