Wu Sansi
In summer 706, when the hermit Wei Yuejiang () submitted an accusation of the adulterous relationship between Wu Sansi and Empress Wei, Emperor Zhongzong was incensed and was set to execute Wei Yuejiang. Song refused, stating that executing Wei Yuejiang would merely bring more rumors and that if Emperor Zhongzong were to execute Wei Yuejiang, he needed to execute Song first. Meanwhile, other officials, including Su Xiang (), Xu Jian (), and Yin Sizhen (), pointed out that it was inappropriate to execute anyone during the summer. Emperor Zhongzong thus spared Wei Yuejiang and exiled him to the Lingnan region. (However, Wei Yuejiang ultimately was unable to escape death, as Empress Wei's associate Zhou Rengui (), then the commandant at Guang Prefecture (廣州, roughly modern Guangzhou, Guangdong), executed Wei Yuejiang as soon as fall came.) Soon thereafter, Wu Sansi had Song sent out of the capital to serve as acting prefect of Bei Prefecture (貝州, in modern Xingtai). Once Song got to Bei Prefecture, he further offended Wu Sansi—as he refused to have tax payments due Wu Sansi as his fief paid to Wu Sansi, citing that the region had just suffered a flood. He was moved to be the prefect of the more distant Hang Prefecture (杭州, roughly modern Hangzhou, Zhejiang), and later served as the prefect of Xiang Prefecture (相州, in modern Handan). It was said that he was clean but strict as a prefect, and his subordinates did not dare to be corrupt.