Verses Indicating Homosexuality is a Sin
1 Corinthians 6:9-11 NKJV
9 Do you not know that the unrighteous will not inherit the kingdom of God? Do not be deceived. Neither fornicators, nor idolaters, nor adulterers, nor homosexuals, nor sodomites, 10 nor thieves, nor covetous, nor drunkards, nor revilers, nor extortioners will inherit the kingdom of God. 11 And such were some of you. But you were washed, but you were sanctified, but you were justified in the name of the Lord Jesus and by the Spirit of our God.
1 Timothy 1:9-11 NIV
9 We also know that the law is made not for the righteous but for lawbreakers and rebels, the ungodly and sinful, the unholy and irreligious, for those who kill their fathers or mothers, for murderers,10 for the sexually immoral, for those practicing homosexuality, for slave traders and liars and perjurers—and for whatever else is contrary to the sound doctrine 11 that conforms to the gospel concerning the glory of the blessed God, which he entrusted to me.
Romans 1:18-19, 25-27 NIV
18 The wrath of God is being revealed from heaven against all the godlessness and wickedness of people, who suppress the truth by their wickedness, 19 since what may be known about God is plain to them, because God has made it plain to them....
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25 They exchanged the truth about God for a lie, and worshiped and served created things rather than the Creator—who is forever praised. Amen. 26 Because of this, God gave them over to shameful lusts. Even their women exchanged natural sexual relations for unnatural ones. 27 In the same way the men also abandoned natural relations with women and were inflamed with lust for one another. Men committed shameful acts with other men, and received in themselves the due penalty for their error.
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Jude 1:7 NIV
7 In a similar way, Sodom and Gomorrah and the surrounding towns gave themselves up to sexual immorality and perversion. They serve as an example of those who suffer the punishment of eternal fire.
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Jesus Defines Marriage as Between One Man and Woman:
Mark 10:6-9 NIV
“But at the beginning of creation God ‘made them male and female.’ 7 ‘For this reason a man will leave his father and mother and be united to his wife, 8 and the two will become one flesh.’ So they are no longer two, but one flesh. 9 Therefore what God has joined together, let no one separate.” (Also see Matthew 19:4-6)
I Corinthians Defines Marriage as Between One Man and Woman:
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1 Corinthians 7:2 NIV
2 But since sexual immorality is occurring, each man should have sexual relations with his own wife, and each woman with her own husband.