![A calligraphic rendition of the name of the Prophet](https://wp-media.patheos.com/blogs/sites/186/2017/04/88b7c6b989731a0ad8ada83deb40488d.jpg)
(Wikimedia Commons public domain image)
“Whoever kills a person who has a truce with the Muslims will never smell the fragrance of Paradise.”
This hadith is reportedly to be found in the Sahih Muslim.
“Beware! Whoever is cruel and hard on a non-Muslim minority, or curtails their rights, or burdens them with more than they can bear, or takes anything from them against their free will, I will complain against that person on the Day of Judgment.”
This hadith is, I’m told, attested in the Sunan Abi Dawud.
For both hadith, see here. I haven’t yet checked the original source.