《资治通鉴·梁纪·梁纪十九》
有人进言说： 按阴阳家的说法，五月不能入居官位，如果违犯这一条，就会死在官位上。 
或曰： 五月不可入官，犯之，终于其位。 
Someone said: According to the theory of Yin and Yang, one cannot enter an official position in May. If this rule is violated, one will die in the official position.