《论衡·卷二十六·实知篇》
孔子生下来以后不知道他的父亲是谁，他的母亲隐瞒了他，他用吹律管的办法知道了自己是殷宋大夫子氏的后代。
孔子生不知其父，若母匿之，吹律自知殷宋大夫子氏之世也。
Confucius did not know who his father was after he was born, his mother concealed him, he used the method of blowing pipes to learn that he was the descendant of Yin Song Daifu Zishi.