《史记·三十世家·郑世家》
十九年，简公到晋，给卫君说情让他回国，并把六个邑封给子产。
十九年，简公如晋请卫君还，而封子产以六邑。
In the nineteenth year, Duke Jian visited the state of Jin, where he begged Lord Wei to let him return to his country, and gave six settlements to Clan Zi.