Abu Hurairah narrated:"The Messenger of Allah(s.a.w) came out to us while we were discussing about Al-Qadar. He became angry such that his face became red, as if a pomegranate was bursting through his cheeks. He said: 'Is this what I ordered you to do?' - or: 'Is this what I have been sent to you with? The people before you were only ruined when they differed about this matter. I order you [I order you] to not debate about it.'". (Daif)