Massacre of the Innocents

[Graufreud]

Ah technology turning ancient bullshit to dust since the invention of the telescope

I read the explanation, sorry I don't remember where that the idea was that the generation that experienced slavery had to die out, and only freeborn were deemed worthy to enter the Promised Land. 
I think it makes sense... and I think it made sense to human authors of the bible (with their Iron Age logic and ethics). 

And then they came to the Promised Land and learned how to be slavers and slave-owners