《礼记·礼运》
臣仆如果遇到父母之丧，或者是刚结过婚，至少在一年之内不服役受差遣。
三年之丧，与新有昏者，期不使。
If a minister or a servant encounters the death of his parents or has just married, he should not serve or be sent on errands for at least one year.