Is slavery even forbidden by the bible?

No its encouraged, as is your daughter marrying her rapist

Lev. 25:44 states that I may indeed possess slaves, both male and female, provided they are purchased from neighbouring nations

In the US they do this with Mexicans now but not Canadians… yet.

Exodus 21:7. says its ok to sell your daughters into slavery

as examples, working on the Sabbath ??

Exodus 35:2 clearly states he should be put to death.