《新唐书·列传·卷一百四十七》
异牟寻担心东蛮、磨些难于掌握，怕他们成为吐蕃的向导，想先打他们。
异牟寻畏东蛮、磨些难测，惧为吐蕃乡导，欲先击之。
Yimuxun was worried that the Dongman and Moshi would be difficult to control and that they would become guides for Tufan, so he wanted to attack them first.