Leviticus 15:24-26

Living Bible

²⁴ A man having sexual intercourse with her during this time is ceremonially defiled for seven days, and every bed he lies upon shall be defiled.

²⁵ “If the menstrual flow continues after the normal time, or at some irregular time during the month, the same rules apply as indicated above, ²⁶ so that anything she lies upon during that time is defiled, just as it would be during her normal menstrual period, and everything she sits on is in a similar state of defilement.