Sahl bin Sa'd bin Malik · The Chapters on Divorce

“Fatimah bint Qais said: 'O Messenger of Allah, (ﷺ) I am afraid that someone may enter upon me by force.' So he told her to move."

the Messenger of Allah (ﷺ), said: "It is not permissible for a woman who believes in Allah and the Last Day to mourn for any deceased person for more than three days, except for her husband."