זוהר שמות — דף קצו ע”א

The mourners of Zion and those who weep over the Temple’s destruction begin the middle four hours of the day with the psalm "By the rivers of Babylon." Heavenly angels also weep with them in heaven. Then come four hours in which judgments are rendered. One must take care not to follow women on the path returning from the cemetery and not to look toward them, in order to distance oneself from the enticements of the impure side that stirs at the time of death.