《后汉书·列传·宗室四王三侯列传》
刘仁以舂陵地势低下潮湿，山林间有毒气，上奏书要求减邑内徙。
仁以舂陵地势下湿，山林毒气，上书求减邑内徙。
Liu Ren, finding that Chunling was low-lying and damp and that the mountains and forests contained poisonous gases, submitted a request to move his fief inland.