When Jesus walked the earth, he condemned the Pharisees for their "traditions", which made God's word "void", saying that "you have made the word of God invalid because of your traditions"....Isaiah aptly prophecied about you, when he said....It is in vain that they keep worshiping me, because they teach commands of men as doctrines".(Matt 15:6, 7,9) The Pharisees, having accepted and promoted the immortality of the soul from Grecian philosophers, though contrary to scripture, Jesus thus gave a condemnation of them.
Jesus further told his apostles to "keep your eyes open and watch out for the leaven of the Pharisees and Sadducees", meaning to "watch out, not for the leaven of the loaves, but for the teaching of the Pharisees and Sadducees".(Matt 16:6,12) Hence, he warned his apostles to guard against listening to the false religious teachings that these taught as "truth", including the teaching of the immortality of the soul.
Jesus himself was well aware of the prophetic statement at Isaiah 53:12 regarding him, whereby it said that "he poured out his soul to the very death".(Matt 26:38) He also understood Ecclesiates 9:5,6 in which it says that "the living are conscious that they will die; but as for the dead, they are conscious of nothing at all, neither do they have anymore wages, because the remembrance of them has been forgotten. Also, their love and their hate and their jealousy have already perished, and they have no portion anymore to time indefinite in anything that has to be done under the sun". Hence, verse 10 identifies that those who go to "sheol", gravedom or the common grave of mankind, that there is "no work nor devising nor knowledge nor wisdom" there.
Thus, when a person dies, his soul dies, just as Ezekiel 18:4, 20 brings to our attention, for we are all "sinners". All their "love and their hate and their jealousy have already perished". He or she becomes non-existent, for Psalms 115:17 says that "the dead themselves do not praise Jah, nor do any going down into silence". A person who has died goes "down into silence", awaiting a resurrection for those who are in God's memory.(Acts 24:15)
If the soul was immortal, then there would be no need of a resurrection, for these have not really died. However, the word resurrection come from the Greek word a·na´sta·sis and literally means “raising up; standing up.†Those that have died, a "deceased soul"(Lev 19:28) and who are resurrected, are then ' raised up' or 'stand up' again as living persons, as a living soul. That is why when God breathed into Adam the "breath of life"(Hebrew form of neshamah), that Adam "became a living soul".(Hebrew nephesh from a root meaning "breathe", and literally can mean "breather", Gen 2:7)
Koehler and Baumgartner’s Lexicon in Veteris Testamenti Libros (Leiden, 1958, p. 627) defines nephesh as: “the breathing substance, making man a[nd] animal living beings Gn 1, 20, the soul (strictly distinct from the greek notion of soul) the seat of which is the blood Gn 9, 4f Lv 17, 11 Dt 12, 23: (249 X) . . . soul = living being, individual, person.†Thus Adam became a "living soul"(ne´phesh chai·yah´) as opposed to a "dead soul".(Lev 21:11, naph·shoth´meth, meaning literally "souls of one dead")
Abraham was told by God concerning the covenant he made with him, that "the uncircumcised man child whose flesh of his foreskin is not circumcised, that soul shall be cut off from his people; he hath broken my covenant". (Gen 17:14, King James Bible ) Thus, the soul can live or it can die or be "cut off ". Abraham's nephew Lot, in responding to the angels warning to flee the city of Sodom, told them: "Behold now, this city is near to flee unto, and it is a little one: Oh, let me escape thither, (is it not a little one? ) and my soul shall live". (Gen 19:20, King James Bible ) Hence, Lot was requesting of the angels to flee to a nearby city in order for his soul or him as person with life, to continue living.
And those of the nation of Israel that disregarded the Sabbath, were told: "Ye shall keep the sabbath therefore; for it is holy unto you : every one that defileth it shall be put to death : for whosoever doeth any work therein, that soul shall be cut off from among his people. " (Exodus 31:14, King James Bible ) Likewise of the Passover, for God said that "the man that is clean, and is not in a journey, and forbeareth to keep the passover, even the same soul shall be cut off from among his people."(Numbers 9:13, King James Bible )
When the nation of Israel were traveling in the wilderness, after having left the land of Egypt, they complainingly said of the manna: "But now our soul has dried away : there is nothing at all , beside this manna, before our eyes". (Numbers 11:6, King James Bible ) At Leviticus 7:20, it says: "But the soul that eateth of the flesh of the sacrifice of peace offerings, that pertain unto the LORD, having his uncleanness upon him, even that soul shall be cut off from among his people". (King James Bible ) And just before the nation of Israel entered the land of Canaan, Moses told the nation: "When the LORD thy God shall enlarge thy border, as he hath promised thee, and thou shalt say, I will eat flesh, because thy soul longeth to eat flesh : thou mayest eat flesh, whatsoever thy soul lusteth after". (Deut 12:20, King James Bible )
Therefore, the soul or a person with life, longs to "eat flesh", can be "dried away", has blood (Jer 2:34) and when someone dies, it can rightly be said that one's soul has died. For as Jesus said on the night before he died: "My soul is exceedingly sorrowful, even unto death." (Matt 26:38, King James Bible ) He died the following day, praying to his Father to "entrust my spirit".(Luke 23:46) As a living soul he died, entrusting his "spirit" or life force to God, so that after having been in Hades or gravedom for three days, he was then resurrected, receiving his "spirit" or life-force back, ' standing up ' again as a spirit Son of God.(1 Cor 15:45)
Jesus used the word soul as meaning one's life, whether it be now or a future one, saying: "For whoever wants to save his soul (Greek psy·khe´ ) will lose it; but whoever loses his soul for my sake will find it. For what benefit will it be to a man if he gains the whole world but forfeits his soul ? or what will a man give in exchange for his soul ? "(Matt 16:25,26) Earlier, Jesus had said that "whoever does not accept his torture stake and follow after me is not worthy of me. He that finds his soul will lose it, and he that loses his soul for my sake will find it."(Matt 10:39)
Consequently, a person who wants to save their "soul" or life now by being unwilling to to follow Jesus example closely, will thus lose their "soul" or hope of living forever. On the other hand, those that "loses his soul for (Jesus) sake will find it."(his future life, by means of a resurrection) In speaking of "when the Son of man is to be revealed", said that "whoever seeks to keep his soul safe for himself will lose it, but whoever loses it will preserve it alive."(Luke 17:39)
Hence, anyone as a person, with all their desires and feelings, can lose his life as an intelligent person or "soul" permanently or can gain life or "soul", ' preserving it alive' forever. Shortly before his death, Jesus said: "He that is fond of his soul destroys it, but he that hates his soul (loves less) in this world will safeguard it for everlasting life".(John 12:25) Of those who "conquered (Satan) because of the blood of the Lamb and because of the word of their witnessing", these did not "love their souls even in the face of death".(Rev 12:11) Hence, these lost their "souls" by death, but regain their lives again by means of a resurrection from the dead.
The apostle Paul wrote concerning Epaphroditus, that "because on account of the Lord's work he came quite near to death, exposing his soul to danger."(Phil 2:30) The apostle Peter spoke of ' purifying your souls' or one's life. The apostle John wrote that "because that one (Jesus) surrendered his soul for us; and we are under obligation to surrender our souls for our brothers."(1 John 3:16) One who follows Jesus perfect example, is willing to "surrender (or give up) his soul" or life now for their "brothers", just as Jesus "surrendered his soul (or life) for us".