Homosexuality is a sin and an abomination before God:
“You shall not lie with a male as with a woman. It is an abomination” (Lev. 18:22)
“If a man lies with a male as he lies with a woman, both of them have committed an abomination. They shall surely be put to death. Their blood shall be upon them” (Lev. 20:13)
Homosexuality is a shameful passion that receives its penalty:
“For this reason God gave them up to vile passions. For even their women exchanged the natural use for what is against nature. Likewise also the men, leaving the natural use of the woman, burned in their lust for one another, men with men committing what is shameful, and receiving in themselves the penalty of their error which was due. And even as they did not like to retain God in their knowledge, God gave them over to a debased mind, to do those things which are not fitting; <...> who, knowing the righteous judgment of God, that those who practice such things are deserving of death, not only do the same but also approve of those who practice them” (Rom. 1:26-28,32)
Homosexuality is a mortal sin:
“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, nor thieves, nor covetous, nor drunkards, nor revilers, nor extortioners will inherit the kingdom of God” (1 Cor. 6:9-10)
Homosexuality is lawlessness, forbidden by the commandments, contrary to sound teaching from God:
“knowing this: that the law is not made for a righteous person, but for the lawless and insubordinate, for the ungodly and for sinners, for the unholy and profane, for murderers of fathers and murderers of mothers, for manslayers, for fornicators, for sodomites, for kidnappers, for liars, for perjurers, and if there is any other thing that is contrary to sound doctrine, according to the glorious gospel of the blessed God which was committed to my trust” (1 Tim. 1:9-11)
Sodom and Gomorrah were destroyed for the sin of homosexuality:
“Now before they lay down, the men of the city, the men of Sodom, both old and young, all the people from every quarter, surrounded the house. And they called to Lot and said to him, ‘Where are the men who came to you tonight? Bring them out to us that we may know them carnally.’ So Lot went out to them through the doorway, shut the door behind him, and said, ‘Please, my brethren, do not do so wickedly!’ ... But the men reached out their hands and pulled Lot into the house with them, and shut the door. And they struck the men who were at the doorway of the house with blindness, both small and great, so that they became weary trying to find the door. Then the men said to Lot, ‘Have you anyone else here? Son-in-law, your sons, your daughters, and whomever you have in the city — take them out of this place! For we will destroy this place, because the outcry against them has grown great before the face of the LORD, and the LORD has sent us to destroy it’” (Gen. 19:4-7,10-13)
“as Sodom and Gomorrah, and the cities around them in a similar manner to these, having given themselves over to sexual immorality and gone after strange flesh, are set forth as an example, suffering the vengeance of eternal fire” (Jude. 1:7)
Nations were driven out of the land promised by God to the Hebrews for the sins of homosexuality:
“Observe what I command you this day. Behold, I am driving out from before you the Amorite and the Canaanite and the Hittite and the Perizzite and the Hivite and the Jebusite” (Ex. 34:11)
“You shall not lie with a male as with a woman. It is an abomination. <...> Do not defile yourselves with any of these things; for by all these the nations are defiled, which I am casting out before you” (Lev. 18:22,24)
“If a man lies with a male as he lies with a woman, both of them have committed an abomination. They shall surely be put to death. Their blood shall be upon them. <...> And you shall not walk in the statutes of the nation which I am casting out before you; for they commit all these things, and therefore I abhor them” (Lev. 20:13,23)