United Kingdom, July 22 -- Justin Bieber has sparked fresh concern over his wellbeing after reposting a clip rejecting the idea of living life as a "clean man".

The 31-year-old pop star shared the video to his Instagram Stories amid ongoing speculation about his alleged drug use, with the footage featuring a moment from rapper DMX's 2013 appearance on the US talk show Iyanla, Fix My Life, in which the late performer - whose real name was Earl Simmons - dismissed the idea of complete sobriety.

In the clip, host Iyanla Vanzant, 71, asks DMX if he wants to "live his life as a clean man".

DMX responds: "When you say clean - no weed? No drinking? Nothing?"

Vanzant replies: "Nothing. You need to be a clear, pure vessel for the voice of God....