Deuteronomy 22:15-17

15then the young woman’s father and her mother shall get and bring out the evidence of her virginity to the elders of the city at the gate [where court is held].

16The father of the young woman shall say to the elders, ‘I gave my daughter to this man as a wife, but he hates her and has turned against her;

17and behold, he has made baseless charges against her, saying, “I did not find in your daughter the evidence of her virginity.” But this is the evidence of my daughter’s virginity.’ And they shall spread out the garment before the elders of the city.