《隋书·帝纪·卷一》
后来武帝征召他回京城，遇上母亲卧病，三年之中，高祖昼夜服侍，不离左右，世人称他为孝子。
后征还，遇皇妣寝疾三年，昼夜不离左右，代称纯孝。
Later, Emperor Wu summoned him back to the capital city, when his mother fell ill, for three years, Gaozu served her day and night, never leaving her side. The world praised him as a filial son.