《资治通鉴·唐纪·唐纪三十四》
于是就从后军中分出二千人，再加上一批最好的飞龙厩马给予太子，并且告谕将士说： 太子仁义孝顺，能够继承我们大唐的帝业，希望你们好好辅佐他。 
乃命分后军二千人及飞龙厩马从太子，且谕将士曰： 太子仁孝，可奉宗庙，汝曹善辅佐之。 
So, two thousand people were picked out from the back team, along with a group of excellent Fei Long Chuang horses to be given to the crown prince. Besides, the generals and soldiers were informed: The crown prince is benevolent, filial and righteous, and able to inherit our Great Tang's throne. I hope you can help him well.