《资治通鉴·晋纪·晋纪三十二》
乙亥，后燕步兵校尉马勤等人阴谋反叛，结果被杀。这件事牵连到了骠骑将军、高阳公慕容崇，以及慕容崇的弟弟东平公慕容澄，慕容盛命他二人自杀。
乙亥，燕步兵校尉马勤等谋反，伏诛；事连骠骑将军高阳公崇、崇弟东平公澄，皆赐死。
On Yichai, the Commandant of the Later Yan Infantry, Ma Qin, and others plotted to rebel, but they were killed. This event implicated the General of Chariots and Cavalry, Gaoyang Duke Murong Chong, as well as Murong Chong's younger brother, Dongping Duke Murong Cheng. Murong Sheng ordered the two of them to commit suicide.