Polygamist Warren Jeffs, who is behind bars for child rape, is under investigation for preaching to his cult members on Christmas day from behind prison bars, according to officials.

Jeffs, convicted of sexual assault of two girls, ages 12 and 14, who he claims were his “spiritual brides,” is serving a life sentence in a Texas prison and is now being investigated for possibly preaching to his cult members via telephone, which is a violation of prison rules.

"We have confirmed that Jeffs made two phone calls on Christmas Day to a relative," Texas Department of Criminal Justice spokesman Jason Clark told the LA Times. "At this point, we're investigating whether he may have circumvented policy and may have spoken to his congregation."

Kody Brown and his four wives often have to defend their controversial religious beliefs and in a sneak peek of the upcoming episode of Sister Wives obtained by RadarOnline.com they try and set the record straight.

The polygamist family is questioned by an Episcopal minister called Danielle who asked if they shared the same faith and beliefs as other Fundamentalist Mormons who live on compounds.

“That is not part of our faith,” Kody explains. “But it comes from a desire to have community and it is because you’re different. Most Fundamentalist Mormons are so vastly different; they have very significant, different beliefs.

Convicted child rapist Warren Jeffs is in critical condition after being rushed to a Texas hospital after falling ill while fasting in jail, RadarOnline.com can report.

The polygamist cult leader, and former head of the Fundamentalist Church of Jesus Christ of Latter Day Saints, is in prison serving a life sentence after being found guilty of sexually assaulting two young girls, ages 12 and 15, whom he claimed were his “spiritual wives.”

Jeffs is in the East Texas Medical Center in Tyler and the prison spokesman described his condition on Monday.  “Jeffs has not been eating/taking in fluids as he should,” the Salt Lake Tribune reported spokesman Jason Clark said in a statement.  “He indicated he was not on a hunger strike but fasting.  The inmate also has other medical conditions that have risen to the level of needing hospitalization.”

Polygamist cult leader Warren Jeffs received the maximum sentence from a Texas jury on Tuesday - life in prison plus 20 years following his convictions of aggravated sexual assault and sexual assault of two young girls, ages 12 and 15, who he claimed were his "spiritual brides," and a shocking new photo of 50 of his young wives was released following the sentence.

The picture shows 50 young girls lined up who are just some of the many "spiritual wives" of Warren Jeffs. Dressed in pastel with the same prairie girl hairstyles, the girls are smiling in front of a picture of Jeffs, the man who sexually abused them and manipulated them into a subservient lifestyle.  He may have as many as 78 wives according to the prosecution.

The horrific evidence the prosecution presented during the sentencing phase of the trial included shocking audio tapes of Jeffs instructing young girls how to sexually please him and recordings of him having sex. One juror cried as the sexually graphic tapes were played.

Polygamist sect leader Warren Jeffs was sentenced to life in prison Tuesday for sexually assaulting two underage girls whom he claimed were his brides in so-called "spiritual marriages."

The Texas jury gave Jeffs the maximum sentence on both counts. The panel announced its decision after deliberating for less than thirty minutes.

Jeffs, 55, -- who often went on bizarre rants throughout his trial -- stood quietly as the decision was read.

One juror wept as the prosecution presented more shocking recordings during the sentencing phase of convicted polygamist cult leader Warren Jeffs’ trial on Monday.

Jeffs was heard talking to young girls aged between 13 and 15 years old where he spoke about “heavenly sessions,” meaning sex and saying “You must realize, that when you get married, you gave yourself to me, mind and body,” according to the Salt Lake Tribune.

The prosecution played multiple tapes during the day, in one Jeffs is giving sexually explicit instructions to four of his “spiritual wives,” one of whom prosecutors say was 14 and another tape played was Jeffs having sex in the baptismal font in the basement of his church.

A former polygamist wife has spoken of her joy at cult leader Warren Jeffs, 55, being found guilty on Thursday of sexually assaulting two young girls, ages 12 and 15.

Flora Jessop was married off to her older cousin when she was 16-years-old and said she suffered horrific sexual abuse from the time she was 13 before she finally escaped the cult.

Polygamist cult leader Warren Jeffs was found guilty of sexually assaulting two young girls, ages 12 and 15, by a Texas jury on Thursday.

Jeffs, 55, was found guilty of aggravated sexual assault against the 12-year-old girl and guilty of sexual assault of the 15-year-old girl.

The jury deliberated for three hours before reaching their verdict and the 10 women and 2 men did not look at Jeffs when the verdict was announced.