《庄子·杂篇·让王》
他们来到岐山的南面，周武王知道了，派他的弟弟旦前去拜见，并且跟他们结下誓盟，说： 增加俸禄二等，授予一等官职。 
至于岐阳，武王闻之，使叔旦往见之。与盟曰： 加富二等，就官一列。 
They came to the south of Qi Mountain. King Wu was aware of their arrival and sent his younger brother Dan to greet them and swear with them, saying: I will double your salaries and promote you by one rank.