Psalm 146

KJV)
3 Put not your trust in princes, nor in the son of man, in whom there is no help.
4 His breath goeth forth, he returneth to his earth; in that very day his thoughts perish.
The Hebrew word the King James Version translates as "breath" in verse 4 is "ruwach," which is the Hebrew word for "spirit." In fact, the NIV translates it as such.
Psalm 146

NIV)
3 Do not put your trust in princes, in mortal men, who cannot save.
4 When their spirit departs, they return to the ground; on that very day their plans come to nothing.
Below is the definition for this Hebrew word "ruwach" so that you can see for yourself.
07307 ruwach {roo'-akh}
from 07306; TWOT - 2131a; n f
AV - Spirit or spirit 232, wind 92, breath 27, side 6, mind 5, blast 4, vain 2, air 1, anger 1, cool 1, courage 1, misc 6; 378
1) wind, breath, mind, spirit
1a) breath
1b) wind
1b1) of heaven
1b2) quarter (of wind), side
1b3) breath of air
1b4) air, gas
1b5) vain, empty thing
1c) spirit (as that which breathes quickly in animation or agitation)
1c1) spirit, animation, vivacity, vigour
1c2) courage
1c3) temper, anger
1c4) impatience, patience
1c5) spirit, disposition (as troubled, bitter, discontented)
1c6) disposition (of various kinds), unaccountable or uncontrollable impulse
1c7) prophetic spirit
1d) spirit (of the living, breathing being in man and animals)
1d1) as gift, preserved by God, God's spirit, departing at death, disembodied being
1e) spirit (as seat of emotion)
1e1) desire
1e2) sorrow, trouble
1f) spirit
1f1) as seat or organ of mental acts
1f2) rarely of the will
1f3) as seat especially of moral character
1g) Spirit of God, the third person of the triune God, the Holy Spirit, coequal, coeternal with the Father and the Son
1g1) as inspiring ecstatic state of prophecy
1g2) as impelling prophet to utter instruction or warning
1g3) imparting warlike energy and executive and administrative power
1g4) as endowing men with various gifts
1g5) as energy of life
1g6) as manifest in the Shekinah glory
1g7) never referred to as a depersonalised force
Notice that out of 378 occurrences of this Hebrew word, 232 times it is translated as either "Spirit" (referring to the Spirit of God) or "spirit" (referring to the spirit of man or an angelic being.) That means that roughly three fifths, or sixty percent, of the time this word is used, it is refers to a spirit. That frequency vastly outnumbers the next closest competing translation of this Hebrew word. Ruwach is translated "wind" 92 times, a little more than 1 fifth or twenty percent of the times ruwach occurs.
So, when Psalms 148:4 says that the "ruwach" of a man departs and his body returns to the ground, it is referring to his spirit departing from his body. And the New Testament explicitly corroborates that fact.
James 2:26 For as the body without the spirit is dead, so faith without works is dead also.
Just like Psalms 148 says that when the human spirit departs, the human body returns to the ground and begins to decompose, James likewise tells us that the body without the spirit is dead. Thus, from both Psalms and James we can clearly see that according the Bible, the human spirit acts as the invigorating engine of the body. And since this is true whether a man is saved or not, we know that even a dead spirit does not cease functioning. The spirit continues to function and invigorate the body even when that spirit is dead.
That's proof number 1 that unsaved men have spirits. And we'll come back to this in a second.
Proof number 2 that unsaved men have spirits can be found in the following manner. Find and ungodly person in scripture and show that they have a spirit.
In Genesis 41we find that the Pharaoh of Egypt has a dream. He calls in the magicians and wise men of Egypt seeking guidance. Here is what verse 8 says of the Pharaoh.
Genesis 41:8 And it came to pass in the morning that his spirit was troubled; and he sent and called for all the magicians of Egypt, and all the wise men thereof: and Pharaoh told them his dream; but there was none that could interpret them unto Pharaoh.
So, Pharaoh had a spirit. Are we to assume he was saved? No, of course not. So that's one example of an unsaved man with a spirit. Let's demonstrate it a little more.
Ezekiel 13:3 Thus saith the Lord GOD; Woe unto the foolish prophets, that follow their own spirit [07307], and have seen nothing!
Here we have Ezekiel testifying to the fact that false prophets have spirits. Are we to assume these false prophets are saved? Again, no, of course not.
Furthermore, Ecclesiastes and Proverbs testify widely to the existence of a spirit in men in general.
Ecclesiastes 8:
8 There is no man that hath power over the spirit [07307] to retain the spirit [07307]; neither hath he power in the day of death: and there is no discharge in that war; neither shall wickedness deliver those that are given to it.
Proverbs 15:4 A wholesome tongue is a tree of life: but perverseness therein is a breach in the spirit [07307].
Proverbs 16:2 All the ways of a man are clean in his own eyes; but the LORD weigheth the spirits [07307].
Pro 16:32 He that is slow to anger is better than the mighty; and he that ruleth his spirit [07307] than he that taketh a city.
So, all men, saved and unsaved, have spirits. And we've also seen from Psalms 146:4, that when men die, their spirits depart and then their body begins to decompose back into dust. But what does all that tell us?
Well, we're back were we started only we've established our preliminary claims in scripture.
So, let's reiterate. When humans look at a dead body, we automatically understand two things. First, it is dead precisely because the human spirit, which formerly animated it, has departed from that body. And Second, this is true whenever someone dies whether they were saved or not. For both the saved and unsaved, the human spirit acts as an invigorating engine to the human body.