You'll have to forgive me for my ignorance of Holy Writ, but I've come across precious little in the Bible to even remotely justify this fact.
"You shall not murder" is in the Bible. The theological question is "what is murder?" not "does the Bible say anything about abortion?"
You see this in the early writings of the Church fathers, where the debate centred around when ensoulment occurs.
Of course the Bible condemns murder. The question that I'm asking is, "Does the Bible consider the termination of a fetus 'murder'"? Here's the only passage that I've ever come across that seems to address the issue:
...but this passage has multiple issues in itself, ranging from whether to interpret "her fruit depart[ing] from her" as a premature birth or a miscarriage, to what "any mischief follow[ing]" even means. Regardless, I'd say that it's hardly a closed case.