《左传·昭公·昭公二十五年》
昭伯抵达国都，先住在城外而查问妻子兄弟，都没有问出什么事。
至，次于外而察之，皆无之。
When Zhao Bo arrived in the capital, he first lived outside the city and inquired about his wife and brothers, but he did not find out anything.