《礼记·内则》
按照夫妇之礼，只有夫妻到了七十岁，两口子才能不避嫌地一直同居共寝，否则就要与妾轮流侍夜。
夫妇之礼，唯及七十，同藏无间。
According to the etiquette of a married couple, a husband and wife can only sleep together and avoid suspicion when they are both seventy years old; otherwise, they must take turns with concubines to serve at night.
<s>[INST] Rewrite the following English passage in the style of Classical Chinese: According to the etiquette of a married couple, a husband and wife can only sleep together and avoid suspicion when they are both seventy years old; otherwise, they must take turns with concubines to serve at night. [/INST] 夫妇之礼，唯及七十，同藏无间。</s>
Rewrite the following English passage in the style of Classical Chinese: According to the etiquette of a married couple, a husband and wife can only sleep together and avoid suspicion when they are both seventy years old; otherwise, they must take turns with concubines to serve at night.
user
夫妇之礼，唯及七十，同藏无间。
assistant