Lev 18:22; You shall not lie with a male as one lies with a female; it is an abomination.
Definitely a sin.
1Cor 6:9; Or 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 effeminate, nor homosexuals,
1Cor 6:10; nor thieves, nor the covetous, nor drunkards, nor revilers, nor swindlers, will inherit the kingdom of God.
Rom 1:26; For this reason God gave them over to degrading passions; for their women exchanged the natural function for that which is unnatural,
Rom 1:27; and in the same way also the men abandoned the natural function of the woman and burned in their desire toward one another, men with men committing indecent acts and receiving in their own persons the due penalty of their error.
Rom 1:28; And just as they did not see fit to acknowledge God any longer, God gave them over to a depraved mind, to do those things which are not proper,
Rom 1:32; and although they know the ordinance of God, that those who practice such things are worthy of death, not only those who do the same, but also those who give approval to those who practice them.
1Tim 1:9; realizing the fact that law is not made for a righteous person, but for those who are lawless and rebellious, for the ungodly and sinners, for the unholy and profane, for those who kill their fathers or mothers, for murderers
1Tim 1:10; and immoral men and homosexuals and kidnappers and liars and perjurers, and whatever else is contrary to sound teaching,
1Tim 1:11; according to the glorious gospel of the blessed God, with which I have been entrusted.
Mark 10:6; “But from the beginning of creation, God made them male and female.