《宋史·列传·卷一百二十九》
吏部郎朱松将儿子朱熹托付给刘子羽，刘子羽同弟弟刘子一心一意地教育他，后来终于成为大学问家。
吏部郎朱松以子熹托子羽，子羽与弟子翚笃教之，异时卒为大儒云。
Zhu Song, Lang of the Ministry of Officials, entrusted his son Zhu Xi to Liu Ziyu. Liu Ziyu and his brother Liu Zi devoted themselves to teaching him, and he finally became a great scholar.