Anushasana Parva 92.13

This other Mantra also should be uttered, viz., to Soma who is fond of the departed manes. A woman that has become impure on account of her season, or one whose ears have been cut off, should not be allowed to remain where a Shraddha is being done, Nor should a woman be brought from a family other than that of the person who is performing the Shraddha.