Hazrat Ibn Umar (may Allah be pleased with them both) said that a woman whose husband passes away will observe a waiting period of four months and ten days. A man said that this is too long. Hazrat Ibn Umar (may Allah be pleased with them both) said that in the days of ignorance, women used to mourn for even longer than this.

Hazrat Umm Salamah (may Allah be pleased with her), Hazrat Aisha (may Allah be pleased with her), and Hazrat Hafsa (may Allah be pleased with her) narrate that the Messenger of Allah (peace and blessings be upon him) said: Any woman who believes in Allah and the Last Day should not observe mourning for more than three days over any deceased person, except for her husband; for him, she should observe mourning for four months and ten days.

Hazrat Hasan (may Allah be pleased with him) was not in favor of mourning.

Hazrat Abi al-Dahha (may Allah be pleased with him) says that a woman's private part has been entrusted to her as a trust.

Hazrat Abi Al-Duha (may Allah be pleased with him) says that one form of trustworthiness is that a woman protects her private parts.

Hazrat Abdullah bin Amr (may Allah be pleased with him) said that the private part is a trust.

Hazrat Ubaid bin Umair (may Allah be pleased with him) says that a woman's private part has been entrusted to her as a trust.

Hazrat Sulaiman bin Yasar, may Allah have mercy on him, was mentioned about women before him, so he said that we are not permitted to mention them.

Hazrat Aamir (may Allah have mercy on him) narrates that a woman whose husband had divorced her came to Hazrat Ali (may Allah be pleased with him), and she believed that she had experienced three menstrual cycles within one month and had performed prayers after becoming pure from each cycle. Hazrat Ali (may Allah be pleased with him) ordered Hazrat Shurayh (may Allah have mercy on him) to decide her case. He said that if trustworthy and religious people from among her relatives testify that she had three menstrual cycles in one month and that she performed prayers after becoming pure from each cycle, then she is truthful; and if they do not testify, then she is lying. Hazrat Ali (may Allah be pleased with him) expressed his approval of this answer in a Roman manner.

Hazrat Anas (may Allah be pleased with him) narrates that the days of menstruation can be four, five, six, seven, eight, nine, or ten; then she should perform ghusl and offer prayers.