Kill them all!
God will know his own!
https://en.wikipedia.org/wiki/Massacre_at_B%C3%A9ziers
"While there remains doubt that the abbot said these words – also paraphrased as "Kill them all, God will know His own", "Kill them all, God will sort his own", or "Kill them all,/and let God sort them out" – there is little if any doubt that these words captured the spirit of the assault,[7] and that the crusaders intended to kill the inhabitants of a stronghold that offered resistance.[8] However, typically that would involve killing the men, not women and children, and not the clergy. The crusaders allowed the routiers to rampage and kill without restraint, but quickly stepped in when it came to the loot.[1]
It is possible that Amalric's account of the death of 20,000 is exaggerated, just like Peter of Vaux de Cernay's report that 7,000 were slain in the Church of St Magdalene. The town's population at the time is estimated at 10,000–14,500, and an unknown number may have escaped the massacre.[9]
Historian Laurence W. Marvin calls Amalric's exhortation "apocryphal" and "The speed and spontaneity of the attack indicates that the legate may not have actually known what was going on until it was over." Marvin adds "clearly most of Beziers population and buildings survived" and the city "continued to function as a major population center."[10]
Simon de Montfort, who later led the crusade, was a participant in these events but not yet in a leadership role."