小年到十五 春節天天有講究

大年初四：三羊開泰

The old saying "three rams bring bliss" is connected with the fourth day, which says that by making a good beginning a happy end comes.
初四則和俗語“三羊開泰”有關，意思是歲首吉利就預示著歲末幸福。

According to folklore, it is also the day to welcome back the Kitchen God. On this day, the Kitchen God would check the household and therefore people should not leave home.
民間還傳說這一日是迎回灶神的日子。這一天灶神會清點每家的人數，所以切忌外出離家。