《元史·列传·卷六》
玉昔帖木儿器量宏大莫测。世祖闻其贤，召入朝廷，命主持宫廷膳食诸事。至元十二年，拜为御史大夫。
遇事廷辩，吐辞鲠直，誓祖每为之霁威。
Yu Xi tiemu'er has a vast and unpredictable capacity. When Shizu heard of his virtue, he summoned him to the court and ordered him to preside over the affairs of the palace kitchen. In the 12th year of the Yuan Dynasty, he was appointed as the chief censor.