Maliks Muwatta Book 46, Hadith Number 6.
Section : The Prohibition against Talking about the Decree.
Yahya related to me from Malik that his paternal uncle, Abu Suhayl ibn Malik said, “I was a prisoner with Umar ibn Abd al-Aziz. He said, ‘What do you think about these Qadariyya (fatalists)?’ I said, ‘My opinion is that one should ask them to turn from wrong action, if they will do so. If not, subject them to the sword.’ Umar ibn Abd al-Aziz said, “That is my opinion.”
Malik added, “That is my opinion also.”