How must he warn her? [If] he said to her in the presence of two [witnesses], “Do not speak with so-and-so,” and she spoke with him —- she is still permitted to her husband, and she may eat terumah. [If] she went with him into a secluded place and stayed with him long enough to become defiled —- she is forbidden to her husband and forbidden to eat terumah; and if he dies, she must receive chalitzah and cannot be taken in yibum.

The following [women] are forbidden to eat terumah: One who says, “I am defiled to you,” or one about whom witnesses testify that she is defiled; and one who says, “I will not drink,” or one whose husband does not want to give her to drink; and one whose husband cohabited with her on the way.  How must he deal with her? He takes her to the court of that place, and they designate two learned men to [accompany] him lest he cohabit with her on the way. R’ Yehudah says: Her husband can be trusted regarding her.