It's a mix between neutral and outright pro-slavery.
The Bible was written - wait for it - within the context of its time. “Pro-slavery” is not really an applicable term.
The Bible is full of incredibly radical passages given the context of its time, but at no point is slavery condemned in the New Testament. In fact, it actually prescribes proper behavior for slaves and masters. It is a disappointing moral failing from a text that was otherwise way ahead of its time.
I think this can be explained in the context of several other passages where Jesus and the Disciples keep emphasizing over and over again that no, we really aren't trying to overthrow Rome!!! Calling directly for immediate abolition of slavery in the 1st century AD context = calling for a civil war against the Roman Emperor.
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