The sin of Judah is written with a pen of iron, and with the point of a diamond: it is graven upon the table of their heart, and upon the horns of your altars. 17:1
as biblical proof that a fetus is a person. Their rationale is if God knows us in the womb, then fetuses are people, too. Of course,
they overlook the verses that show God's willingness to kill both the born and unborn. ,
22:3