There isn’t a single Bible verse that says abortion is murder or even a crime. There are plenty of verses, however, that associate life with breath, which would only happen at birth.
The “life begins at conception” dogma is a massive political scam deriving from Catholic doctrine, that beginning in the late 70s-early 80s was then aggressively marketed to evangelical Protestants, as soon as Republicans discovered its utility as a wedge issue to align various Christian sects behind the Republican Party. Ronald Reagan was the first “pro-life” President. Before that, the concept didn’t really exist.
“Pro-life” is now such a Christian litmus test in America that all you have to do is profess your fealty to it, and then any other number of sins and obviously un-Christian bad behavior, greed, lust, pride, and sinfulness will be instantly excused. See: Donald Trump, who can barely stumble through a word of scripture and has been married three times, had sex with porn stars and paid them off, palled around with Jeffrey Epstein and Ghislaine Maxwell, and has been credibly accused of sexual harassment and rape by dozens of women. Ergo, “pro-life” has also become a useful tool for uniting heathen misogynists like Trump with true believers.
To a true believer in “pro-life” dogma, the most outwardly moral pro-choice person in the world can’t hold a candle to the most flagrantly despicable “pro-life” so-called Christian. The “unborn baby” must win every time.
If voters are made to truly believe that millions of “fetal lives” are at stake, then nothing else matters — and “pro-life” politicians such as Trump thereby successfully proof themselves against judgment on any other issue from a critical mass of religious voters.
This is all rather recent, an alignment that has occurred within the last few decades in America, and it has nothing more than the entrenchment of the Republican Party’s power as its true objective. But no, it has no Biblical basis.