Is aborting a fetus at six months — medically proven to have severe deformities (a hole in the brain with fluid leakage, and a hole in the spinal column causing complete paralysis and mental retardation) — considered killing a soul, what is the legitimate Shar’i ruling for this situation, and what is incumbent upon the spouses?

Abortion after the ensoulment is impermissible except in cases of extreme necessity, such as a risk to the mother's life. Fetal deformity is not a justification for abortion. If an abortion occurs without necessity, it is a grave sin requiring repentance. The perpetrator must pay the diyah (blood money) for the fetus, which is five camels or fifty gold dinars (212.5 grams). However, if the fetus is born alive and then dies, the full diyah is required (one hundred camels or one thousand gold dinars), along with the expiation of fasting for two consecutive months. Scholars have differed on who is obligated to pay the ghusra (a portion of blood money): the perpetrator or their 'aqilah (male relatives on the father's side).