《淮南子·泰族训》
又派舜深入林麓之中，狂风雷雨也没使舜迷失方向和道路。于是尧帝就将自己的九个儿子托付给舜，并赠给舜昭华美玉，正式将君位传授给舜。
既入大麓，烈风雷雨而不迷，乃属以九子，赠以昭华之玉，而传天下焉。
He also sent Shun deep into the woods, and even wind and storms could not make Shun lose his way. So Emperor Yao entrusted his nine sons to Shun, and gave Shun the Zhaohua jade to formally transfer the throne to him.