Abd Al-Rahmân b. Mahdî reports:

I entered upon Mâlik b. Anas when a man was asking him about the Qur`ân. [Imâm Mâlik] said, “Perhaps you are a companion of  Amr b. ‘Ubayd. May Allâh curse ‘Amr, for he was the one who innovated this bid’ah of Kalâm  . If Kalâm was knowledge, the Companions and their Followers would have spoken it, like they spoke about the regulations and laws [of Islam]. But [Kalâm] is falsehood that leads to falsehood.”

Abul-Fadl Al-Muqri`Al-Râzî, Ahâdîth fî Dham Al-Kalâm wa Ahlihî p96.
Al-Harawî, Dham Al-Kalâm wa Ahlihî no.874.