Romans 8:13 says,
"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."
In other words, Paul is saying that if live after the flesh you are going to die (die spiritually), but if you put to death the deeds of the body via by the help of the Holy Spirit, you shall live (spiritually live) (Note: "works of the flesh" can refer to sin, see Galatians 5:19-21; And deeds can refer to sin, see Jude 1:15). This is confirmed even more in Romans 8:1 that there is no Condemnation those in Christ Jesus who walk not after the flesh (i.e. sin), but who walk after the Spirit. Galatians 5:16 says, "This I say then, Walk in the Spirit, and ye shall not fulfil the lust of the flesh." We are told in Galatians 5:19-21 that they that do such sinful things (such as adultery, fornication, hatred, drunkenness, etc.) will not inherit the Kingdom of God. The phrase "inherit the Kingdom of God" is alluded to salvation in the Parable of the Sheep and Goats (Matthew 25:31-46). For the sheep on the Lord's right hand (the saints) were told this,
34 "Then shall the King say unto them on his right hand, Come, ye blessed of my Father, inherit the kingdom prepared for you from the foundation of the world:
35 For I was an hungred, and ye gave me meat: I was thirsty, and ye gave me drink: I was a stranger, and ye took me in" (Matthew 25:34-35).
The goats on the left hand side of the Lord were told this,
41 "Then shall he say also unto them on the left hand, Depart from me, ye cursed, into everlasting fire, prepared for the devil and his angels:
42 For I was an hungred, and ye gave me no meat: I was thirsty, and ye gave me no drink"
(Matthew 25:41-42).
The goats were told to depart from Jesus because they did not help the poor.
This same truth is expressed in Luke 10:25-37.
For in Luke 10:25-28, Jesus agrees with the lawyer on the truth that we must love God and love our neighbor as a part of inheriting eternal life.
Luke 10:29-37 (the Parable of the Good Samaritan) shows that helping the poor beat up guy on the side of the road is the equivalent of "loving our neighbor."