Sex | Warren Jeffs Trial: Sex Tape Details Emerge

Texas state prosecutors wrapped up their case against polygamist religious leader Warren Jeffs by using his own words against him: a disturbing August 2006 recording of what Jeffs' called a "heavenly comfort" training session with three of his so-called "spiritual wives."

One of the females was exactly 12 years, one month, and three days old when the recording was made. Jeffs was charged with aggravated sexual assault for this incident, considered a first-degree felony.

Sexual contact with his wives, Jeffs believes, revives him spiritually and brings the girls closer to God.

The recording was made at the Yearning for Zion ranch in Texas, owned by the FLDS. It begins with Jeffs asking the girl how she feels.

"Feels good," she responds, according to a copy of the transcript reviewed by ABC News.

"Everyone else let go of me, back away a little" Jeffs says soon after. "Please get on the other side of the bed."

"You shall learn the powers of the spirit of God as a heavenly wife should," Jeffs tells the 12-year-old. "Let the heavenly comfort hear us."

"We bless you, by the Lord, at this young age. To come to know God and his power, and feel his presence," says Jeffs, according to the transcript.

Throughout the 20-minute tape, there are periods where sounds described by the transcript as "rhythmic heavy breathing" can be heard.

At one point, Jeffs again asks the girl how she feels.

"I feel fine, thank you," she says.

Jeffs later tells a woman in the room to "face her""an apparent reference to the 12-year old. He is also heard saying, "want to distract her."

As the session ends, Jeffs begins to pray.

"Behold father these three ladies, innocent and pure," he says. "We thank you for these gifts and join in a prayer of oneness."

Then, Jeffs addresses the 12-year old.

"Come give me a hug," Jeffs says.

Texas Ranger Nick Hanna testified the recording was found when Jeffs was arrested during a traffic stop in Nevada a few weeks later. Another copy was found at the Yearning for Zion ranch when it was raided in 2008.

Jeffs, the leader of a radical sect of Mormonism know as the Fundamentalist Church of Jesus Christ of the Latter Day Saints (FLDS), is on trial for two counts of sexual assault of a child. He is accused of forcing two teenage girls into "spiritual marriage," and fathering a child with one of them when she was 15. The charges carry a maximum sentence of life in prison.