(Devarim 20:18) "So that they not teach you to do according to all their abominations": whereby we are taught if they repented, they are not killed. "and you sin to the L-rd your G-d": If you do not act in accordance with all that is said here you are called "sinners to the L-rd."
Sifrei Devarim 202
Tap any verse to see what it echoes — and start a chain or echo from it.