Where does Christ ever mention homosexuality … in the red letters?

Answer:

You place a false restriction on your question because Jesus said to the disciples (in red letters): "He who hears you hears Me, he who rejects you rejects Me, and he who rejects Me rejects Him who sent Me" (Luke 10:16). Thus, the words of the apostles carry equal weight as Christ's because they taught the words of Christ:

"But I make known to you, brethren, that the gospel which was preached by me is not according to man. For I neither received it from man, nor was I taught it, but it came through the revelation of Jesus Christ" (Galatians 1:11-12).

"If anyone thinks himself to be a prophet or spiritual, let him acknowledge that the things which I write to you are the commandments of the Lord" (I Corinthians 14:37).

Therefore:

• Romans 1:26-27 "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."
• I Corinthians 6:9-11 "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. 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."
• I Timothy 1:9-11 "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."
• Jude 6-7 "And the angels who did not keep their proper domain, but left their own abode, He has reserved in everlasting chains under darkness for the judgment of the great day; 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."

And because we are told concerning the events in the Old Testament, "Now these things became our examples, to the intent that we should not lust after evil things as they also lusted" (I Corinthians 10:6), we can also examine what sins were condemned in the Old Testament and why.

• Genesis 19:4-5, 13 "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. ... 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.""
• Leviticus 18:22 "You shall not lie with a male as with a woman. It is an abomination."
• Leviticus 20:13 "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."
• Deuteronomy 23:17-18 "There shall be no ritual harlot of the daughters of Israel, or a perverted one of the sons of Israel. You shall not bring the wages of a harlot or the price of a dog to the house of the LORD your God for any vowed offering, for both of these are an abomination to the LORD your God."
• Judges 19:22-24 "As they were enjoying themselves, suddenly certain men of the city, perverted men, surrounded the house and beat on the door. They spoke to the master of the house, the old man, saying, "Bring out the man who came to your house, that we may know him carnally!" But the man, the master of the house, went out to them and said to them, "No, my brethren! I beg you, do not act so wickedly! Seeing this man has come into my house, do not commit this outrage. Look, here is my virgin daughter and the man's concubine; let me bring them out now. Humble them, and do with them as you please; but to this man do not do such a vile thing!"
• I Kings 14:24 "And there were also perverted persons in the land. They did according to all the abominations of the nations which the LORD had cast out before the children of Israel."
• I Kings 15:12 "And he banished the perverted persons from the land, and removed all the idols that his fathers had made."
• I Kings 22:46 "And the rest of the perverted persons, who remained in the days of his father Asa, he banished from the land."
• II Kings 23:7 "Then he tore down the ritual booths of the perverted persons that were in the house of the LORD, where the women wove hangings for the wooden image."
• Ezekiel 16:46-50 "Your elder sister is Samaria, who dwells with her daughters to the north of you; and your younger sister, who dwells to the south of you, is Sodom and her daughters. You did not walk in their ways nor act according to their abominations; but, as if that were too little, you became more corrupt than they in all your ways. As I live, says the Lord GOD, neither your sister Sodom nor her daughters have done as you and your daughters have done. Look, this was the iniquity of your sister Sodom: She and her daughter had pride, fullness of food, and abundance of idleness; neither did she strengthen the hand of the poor and needy. And they were haughty and committed abomination before Me; therefore I took them away as I saw fit."

But then Jesus did use Sodom and Gomorrah as an example of extreme wickedness that God destroyed. Recall that Jude 6-7 gives the reason why.

• Matthew 10:15 "Assuredly, I say to you, it will be more tolerable for the land of Sodom and Gomorrah in the day of judgment than for that city!"
• Matthew 11:23-24 "And you, Capernaum, who are exalted to heaven, will be brought down to Hades; for if the mighty works which were done in you had been done in Sodom, it would have remained until this day. But I say to you that it shall be more tolerable for the land of Sodom in the day of judgment than for you."
• Mark 6:11 "And whoever will not receive you nor hear you, when you depart from there, shake off the dust under your feet as a testimony against them. Assuredly, I say to you, it will be more tolerable for Sodom and Gomorrah in the day of judgment than for that city!"
• Luke 10:12 "But I say to you that it will be more tolerable in that Day for Sodom than for that city."
• Luke 17:29 "but on the day that Lot went out of Sodom it rained fire and brimstone from heaven and destroyed them all."