There are a number of direct references to homosexuality in the Bible.
In Mosaic law, male homosexuality is identified as an "abomination

Abomination (Bible)

Abomination is an English term used to translate the Biblical Hebrew terms shiqquwts and sheqets, which are derived from shâqats, or the terms , tōʻēḇā or to'e'va or ta'ev...

".
In the New Testament

Homosexuality in the New Testament

In the New Testament, the gospels do not contain explicit discussion of homosexuality, but instead only of "sexual impurities" or porneia in general, which in the context of Mosaic law can be understood to include homosexual acts, but Christian views on the old covenant vary. The epistles of Paul...

, Paul of Tarsus

Paul of Tarsus

Paul the Apostle , also known as Saul of Tarsus, is described in the Christian New Testament as one of the most influential early Christian missionaries, with the writings ascribed to him by the church forming a considerable portion of the New Testament...

 condemns arsenokoitēs, a term related to male homosexuality that is open to much interpretation; it could mean male homosexual acts, male prostitution, or sex with men in general (hetero- or homosexual). Paul also makes reference to female homosexuality when he refers to "unnatural relations" between women in the Epistle to the Romans

Epistle to the Romans

The Epistle of Paul to the Romans, often shortened to Romans, is the sixth book in the New Testament. Biblical scholars agree that it was composed by the Apostle Paul to explain that Salvation is offered through the Gospel of Jesus Christ...

.
Chapters 18 and 20 of Leviticus

Leviticus

The Book of Leviticus is the third book of the Hebrew Bible, and the third of five books of the Torah ....

, which form part of the Holiness code

Holiness code

The Holiness Code is a term used in biblical criticism to refer to Leviticus 17-26, and is so called due to its highly repeated use of the word Holy. It has no special traditional religious significance and traditional Jews and Christians do not regard it as having any distinction from any other...

, contain the following verses:

Thou shalt not lie with mankind, as with womankind: it is an abomination

Abomination (Bible)

Abomination is an English term used to translate the Biblical Hebrew terms shiqquwts and sheqets, which are derived from shâqats, or the terms , tōʻēḇā or to'e'va or ta'ev...

.(Leviticus 18

Leviticus 18

Leviticus 18 is a chapter of the Biblical book of Leviticus. It narrates part of the instructions given to Moses by God on Mount Sinai. The chapter deals with a number of sexual activities considered 'unclean' or 'abominable'...

:22 KJV)

If a man also lie with mankind, as he lieth with a woman, both of them have committed an abomination: they shall surely be put to death; their blood shall be upon them.(Leviticus 20:13 KJV)

The two verses have traditionally been interpreted by fundamentalist Christians as blanket prohibitions against homosexual acts.
The story of Sodom and Gomorrah

Sodom and Gomorrah

Sodom and Gomorrah were cities mentioned in the Book of Genesis and later expounded upon throughout the Hebrew Bible, the New Testament and Deuterocanonical sources....

 in Genesis has traditionally been interpreted within Christianity as a punishment for homosexuality; Judaism regards it as a story about the need for hospitality.

The Hebrew Bible

Hebrew Bible

The Hebrew Bible is a term used by biblical scholars outside of Judaism to refer to the Tanakh , a canonical collection of Jewish texts, and the common textual antecedent of the several canonical editions of the Christian Old Testament...

 uses the word kedeshah for prostitute.