《史记·三十世家·鲁周公世家》
季友临降生时，桓公令人为之占卜，卜人说： 这是一个男孩，其名叫作 友 ，将来位于两社之间，定将成为公室重臣。
季友之将生也，父鲁桓公使人卜之，曰： 男也，其名曰 友 ，间于两社，为公室辅。
When Ji You was about to be born, Duke Huan asked someone to divine for him. The diviner said, "This is a boy, his name is You. In the future, he will be between two shej altars and will definitely become a high-ranking official in the public office."