Our human spirit, soul, and body are distinct, but not separate, except in the case of death where spirit and soul are separate from the body. At least, the 'first death.' Paul, as well as the entire Old and New Testaments, are consistent, as they should be, with this 'anthropology.' Although sometimes in common parlance, as well as some Christians' outright teaching, 'spirit' and 'soul' are made synonyms out of soulishness and ignorance (1 Cor 2--3; Heb 4:12). Further eating of the word of God can save us from that.
Jehovah God formed man from the dust of the ground and breathed into his nostrils the breath of life, and man became a living soul. Gen 2:7. Jehovah God formed man from the dust of the ground [body] and breathed into his nostrils the breath [spirit] of life, and man became a living soul [soul, person].
The burden of the word of Jehovah concerning Israel. Thus declares Jehovah, who stretches forth the heavens and lays the foundations of the earth and forms the spirit of man within him. Zech 12:1. Our body contacts the physical world and houses our person, our soul. We're created in the image of God, with soul [mind, emotion, will--which can be shown Scripturally], and likeness of God--somehow even in our appearance. But our human spirit is for God's purpose. Although angels are 'spirits' in terms of immateriality, neither they nor other creations except us have a human spirit. To contact...God. Directly. This can also be seen in the difference between the Tree of Life and the Tree of Knowledge. One can [think] one knows about God, or knows about good and evil; but salvation, and God's eternal purpose, comes by receiving and experiencing God personally. Which is done by and with and in the spirit (lower-case 's'). Of course our heart, our soul is involved, and needs to 'repent,' to be opened and turned to Christ. But in our spirit we contact...The Spirit (upper-case 'S,' in English). The Triune God, embodied in Jesus Christ, crucified and resurrected to both accomplish redemption as well as become a life-giving Spirit (1 Cor 15:45). Now the Lord is the Spirit (2 Cor 3:17). Then, he who is joined to the Lord is one spirit (1 Cor 6:17). This eternal forgiveness, redemption, and salvation, is made possible by the shed blood of Jesus. Blessed are those who wash their robes that they may have right to the tree of life and may enter by the gates into the city (Rv 22:14).
Anyway, Salah, How does the Spirit have defilement? What are defilements of the Spirit? The divine Spirit (God) has no defilement or defilements. Nor can He. In the fall of man, when Adam (and Eve) sinned by eating something sinful--namely the nature of Satan, their body became sinful 'flesh,' their soul became enemy and rival of God, and their spirit became dormant, deadened. Defilements of the flesh are what our flesh does and receives. Defilement of our spirit is defilement to our spirit, namely sin which deadens it or keeps it dormant. But for someone like you, who I believe has yet to receive Christ, you need to be convicted of your own sinfulness and death so as to open to, turn to, and receive Christ as your Lamb from God (Jn 1:29, 34)! and be saved (2 Cor 6:2)! In an acceptable time I listened to you, and in the day of salvation I helped you. Behold, now is the well-acceptable time; behold, now is the day of salvation.