Biblical passages that mention homosexuality:
Leviticus 18:22 - Do not have sexual relations with a man as one does with a woman; that is detestable.
Leviticus 20:13 - If a man has sexual relations with a man as one does with a woman, both of them have done what is detestable. They are to be put to death; their blood will be on their own heads.
Romans 1:24-27 - Therefore God gave them over in the sinful desires of their hearts to sexual impurity for the degrading of their bodies with one another. They exchanged the truth about God for a lie, and worshiped and served created things rather than the Creator - who is forever praised. Amen. Because of this, God gave them over to shameful lusts. Even their women exchanged natural sexual relations for unnatural ones. 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.
I Corinthians 6:9 - Or do you not know that wrongdoers will not inherit the kingdom of God? Do not be deceived: Neither the sexually immoral nor idolaters nor adulterers nor men who have sex with men.
1 Timothy 1:10 - 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.
Source: biblegateway.com