Because the mixed multitude separated between ‘six’ and ‘seven’, at the Giving of the Torah, as it says: (Ex. 32:1) And the People saw that Moses delayed (vo-shesh)... And they the sages establishedlxviiBT Shabbat 89a that vo-shesh means ‘in six’ (ba-shesh) – in these six hours they made the golden calf, and they separated between Vav ו (=6) and Qei ה (=5), which are between six to seven. So will the blessed Holy One separate them, between the sixth millennium and the seventh.
For because of them, She Shekhinah was as ‘a broken unleavened-bread’, (Deut. 16:3)... the bread of poverty... Poverty, specifically!