I would think "thou shall not murder" would have covered abortion just fine.
ealgeone:
Well it could cover it? well in fact, for an orthodox Christian believer and one who sees the Philosophical reality that infant in the womb is in substance no different than the older man or woman, only the appearances [accidents are different], I agree, it would. However murder has always been understood as the premeditated taking of a life. Someone could take that to say the Death penalty is murder since a prisoner is no longer a thread. Killing in a just war is not an objectively good thing, but it is not murder.
You are using a allegorical scriptural approach to the commandment thou shall not murder, which is one that is actually solid and I agree with. The Catholic Church in the Catechism lays out the multiple senses in which scripture speaks one is the Literal but the other is the Allegorical, which encompasses several dimensions, moral, anagogical [leading to a faith truth, while using a metaphor, parable, etc].
The problem is someone can take the literalist approach and say “abortion is not mentioned” and say I will only accept what the Bible explicitly says [many here on FR make such claims]. Again, for the record, in the Catechism of the Catholic Church, abortion is linked to the commandment thou shall not kill so your approach here is actually consistent with the Catholic theological approach to the question.