Apostolic Tradition 18

1When the teacher finishes his instruction, the catechumens shall pray by themselves, apart from the believers. And [all] women, whether believers or catechumens, shall stand for their prayers by themselves in a separate part of the church. And when [the catechumens] finish their prayers, they must not give the kiss of peace, for their kiss is not yet pure. Only believers shall salute one another, but men with men and women with women; a man shall not salute a woman. And let all the women have their heads covered with an opaque cloth, not with a veil of thin linen, for this is not a true covering.