Justin Bieber's backstage Bible classes

Justin Bieber is said to be hosting backstage bible classes before his concerts. Photo/AP

Justin Bieber has been holding Bible studies classes backstage during his Purpose World Tour.

The 22-year-old singer is no stranger to controversy after he egged a neighbour's house and got into a fight with Orlando Bloom, but after turning to religion two years ago, the Sorry singer's life has "changed for the better", and he's now intent on spreading that message to the crew on his tour.

A source told The Sun newspaper: "Backstage on his Purpose tour, Justin has been sitting down with his opening acts and encouraging them to put Christ before everything.

"His aim is to convert the people he loves and warn other stars against the evils of the industry."

The What Do You Mean? musician reportedly took the step toward religion after he realised he didn't want to "go off the rails" like other celebrities before him.

The source added: "Justin's life changed for the better since he found God and he has been making better decisions now that he has found peace within his faith.

"After seeing so many other celebs go off the rails, he wants to help his friends find the joy and happiness he has."

The news comes after the Love Yourself hitmaker said earlier this year that he "loves" talking about his faith with people, and claimed he wanted to "honestly live like Jesus."

He said: "I love talking about my faith.

"Christians have left such a bad taste in people's mouths - just like, overly pushy with the subject, overly churchy and religious.

"I think that people, as soon as they start hearing me saying I'm a Christian, they're like, 'Whoa, Justin! Back up, take a step back!'

"I just wanna honestly live like Jesus."

- Bang! Showbiz