《论衡·卷二十·论死篇》
假如人死后，变成的气有毒，就能害人；不变成有毒的气，就不能害人。
使人死，其气为毒乎，害人；不为乎，不能害人。
If after someone dies, the air that they become is toxic, then it can harm humans. If it doesn't become toxic air, then it can't harm humans.