Passage: Arnaud Amalric (Latin: Arnoldus Amalricus; died 1225) was a Cistercian abbot who played a prominent role in the Albigensian Crusade. He is remembered for purportedly advising a soldier who was worried about killing orthodox Catholics instead of just heretic Cathars, prior to the sack of Beziers, to simply kill everyone, as God would sort it all out later.

Question: Based on this passage, who said kill them all and let god sort?
Steam of consciousness below:
This is the relevant information: He is remembered for purportedly advising a soldier who was worried about killing orthodox Catholics instead of just heretic Cathars, prior to the sack of Beziers, to simply kill everyone, as God would sort it all out later.
So, the answer is Arnaud Amalric.