Nothing directly.
If inclined to do so, you can find and interpret various bible verses to be pro-life or pro-choice. The bible, actually, believe it or not, never once specifically mentions the issue.
People use various verses and try to read what they want into them. But, some of the ones that are closest to the issue (such as one where the punishment for harming a woman whose fetus dies is a fine, whereas if the woman dies -- death is the punishment) are pretty clearly pro-choice actually.
Though I don't claim the bible takes a position on the issue one way or the other.
Abortion in the Bible:
The verse is:
"If men struggle with each other and strike a woman with child so that she has a miscarriage, yet there is no further injury, he shall surely be fined as the woman’s husband may demand of him, and he shall pay as the judges decide. 23 But if there is any further injury, then you shall appoint as a penalty life for life, 24 eye for eye, tooth for tooth, hand for hand, foot for foot, 25 burn for burn, wound for wound, bruise for bruise."
Ex. 21:22-25, The New American Standard Bible
So, the verse seems to say if the fetus miscarries it is not treated as a life, right?
How about Numbers 5:21-22 which suggests that God would like to use a miscarriage as a punishment for adulterous women?
If interested in all this, you can read more at abortion in the bible.