《资治通鉴·唐纪·唐纪六十四》
起初，李德裕任宰相执掌朝政时，提拔白敏中为翰林学士；到唐武宗死后，李德裕失势，白敏中于是趁朝廷上下对李德裕一片愤怒，竭力排挤李德裕，指使李德裕的党羽李咸揭发李德裕执政时的罪过，李德裕因此而由东都留守贬为太子少保、分司东都，为闲官。
初，李德裕执政，引白敏中为翰林学士。乃武宗崩，德裕失势，敏中乘上下之怒，竭力排之，使其党李咸讼德裕罪，德裕由是自东都留守以太子少保、分司。
Initially, when Li Deyu was the prime minister and in charge of the affairs of state, he promoted Bai Minzhong to be Hanlin Academician; after Tang Wuzong's death, Li Deyu fell out of favor, so Bai Minzhong took advantage of the anger towards Li Deyu in the court and did everything possible to exclude him, commanding Li Deyu's follower Li Xian to expose Li Deyu’s mistakes while in office, thus causing Li Deyu to be demoted from Dongdu Prefect to the idle post of junior tutor in the prince's residence and to be assigned to Dongdu.