Manava Dharmashastra 9.9

9.9

yādṛśaṃ bhajate hi strī sutaṃ sūte tathāvidham
tasmāt prajāviśuddhyarthaṃ striyaṃ rakṣet prayatnataḥ //

As the male is to whom a wife cleaves, even so is the son whom she brings forth; let him therefore carefully guard his wife, in order to keep his offspring pure.