Manusmriti

siva.sh/manusmriti/9/102

तथा नित्यं यतेयातां स्त्रीपुंसौ तु कृतक्रियौ । यथा नाभिचरेतां तौ वियुक्तावितरेतरम् ॥ १०२ ॥

sanskrit

Let man and woman, united in marriage, constantly exert themselves, that (they may not be) disunited (and) may not violate their mutual fidelity.

english translation

tathA nityaM yateyAtAM strIpuMsau tu kRtakriyau | yathA nAbhicaretAM tau viyuktAvitaretaram || 102 ||

hk transliteration by Sanscript