《后汉书·列传·耿弇列传》
四年，诏耿弇进攻渔阳，耿弇以父亲据在上谷，本与彭宠功劳相同，又兄弟都不在京师，自起疑虑，不敢独进，上书请回洛阳。
四年，诏弇进攻渔阳。弇以父据上谷，本与彭宠同功，又兄弟无在京师者，自疑，不敢独进，上书求诣洛阳。
Four years later, Geng Yan was ordered to attack Yuyang, but since his father was guarding Shanggu, and his achievements were on par with those of Pengchong, and since his brothers were all out of the capital, he began to worry and did not dare advance, so he submitted a memorial requesting to return to Luoyang.