Markandeyapurana 32.24

32.24

patitairmalinaiścaiva na puṣṇāti pitāmahān /
varjanīyaṃ tathā śrāddhe tathodakyāśca darśanam //

What has been touched by a corpse or by a recently-delivered woman,[30] and by those who have been long ill, by outcastes, and by filthy persons, does not nourish the pitṛs.

And the celebrant must moreover avoid the sight of a woman who is in her courses; and he must shun sitting together with baldpated men and drunken men at a śrāddha, out of respect.