Jesus, the only begotten Son of God says: “God is a Spirit: and they that worship him must worship him in spirit and in truth” (John 4:23–24).
“It is the spirit that quickeneth; the flesh profiteth nothing: the words that I speak unto you, they are spirit, and they are life” (John 6:63).
“Now this I say, brethren, that flesh and blood cannot inherit the kingdom of God; neither doth corruption inherit incorruption” (1 Corinthians 15:50).
“Therefore, brethren, we are debtors, not to the flesh, to live after the flesh. For if ye live after the flesh, ye shall die: but if ye through the Spirit do mortify the deeds of the body, ye shall live” (Romans 8:12-13).
“There is therefore now no condemnation to them which are in Christ Jesus, who walk not after the flesh, but after the Spirit” (Romans 8:1).