That the daughters of Israel went yearly to lament the daughter of Jephthah the Gileadite four days in a year.
All Commentaries on Judges 11:40 Go To Judges 11
Augustine of Hippo
But we rightly ask whether human sacrifices must have foreshadowed future events.… But if this were true, this type of sacrifice would not displease God. But in fact the Scriptures themselves clearly testify that human sacrifices displease him. For when God wanted and commanded all the firstborn to belong to him and to be his, he nonetheless wanted the firstborn of humankind to be redeemed by their parents, so that they would not entrust their firstborn children to God through immolation.…
Now clearly God loves and rewards those sacrifices when a just man endures injustice and struggles for the truth even to the point of death or when he is killed by enemies whom he has offended for righteousness’ sake, as he has returned them good for evil, that is, love instead of hatred.… In imitation of Abel, thousands of martyrs have struggled for the truth to the point of death and have been sacrificed by savage enemies. The Scripture says of them, “God has tested them like gold in a furnace and he has accepted them as a whole burnt offering.” So too the apostle says, “I am being sacrificed.”
But that is not how Jephthah made a whole burnt offering to the Lord out of his daughter. Rather he offered her as a literal sacrifice in the way that it was commanded for animals to be offered and forbidden for humans to be sacrificed. What he did seems rather similar to what Abraham did. In that instance the Lord gave him a special command that this ought to be done. He did not order him by way of a general commandment that such sacrifices should take place at some time. Indeed, the general rule prohibited it.