《旧唐书·本纪·卷十八》
 朕听说夏、商、周三代以前，未曾谈过佛教的事，自汉、魏以后，佛教逐渐兴起。
朕闻三代已前，未尝言佛，汉魏之后，像教浸兴。
I have heard that in the three dynasties of Xia, Shang and Zhou, there was no talk of Buddhism, and since the Han and Wei dynasties, Buddhism has gradually emerged.