Just one? Let's list them:
1 - Leviticus 18:22 You shall not lie with a male as with a woman; it is an abomination.
2 - Leviticus 20:13 If a man lies with a male as with a woman, both of them have committed an abomination; they shall be put to death; their blood is upon them.
3 - Romans 1:26-27 For this reason God gave them up to degrading passions. Their women exchanged natural intercourse for unnatural, and in the same way also the men, giving up natural intercourse with women, were consumed with passion for one another. Men committed shameless acts with men and received in their own persons the due penalty for their error.
So that's three certainly, with a possible two more in the form of 1 Corinthians 6:9-11 and 1 Timothy 1:8–10, depending on the meaning of "ἀρσενοκοίτης" which comes from the Greek words "ἄρσην", meaning "male" and "κοίτην" which means "bed, with a sexual connotation" and has been variously translated as "abusers of themselves with mankind", "sodomites" or "men who practice homosexuality". So now it's at least three to four, possibly five to four, but with one Biblical passage clearly calling for the murder of homosexuals.