Richter 11:39

At the end of two months she returned to her father again, "and he did to her the vow that he had vowed, and she knew no man." I consequence of this act of Jephthah and his daughter, "it became an ordinance (a standing custom) in Israel: from year to year (see Exo 13:10) the daughters of Israel go to praise the daughter of Jephthah the Gileadite four days in the year. תּנּה does not mean θρηνεῖν, to lament or bewail (lxx, Chald., etc.), but to praise, as R. Tanchum and others maintain. With regard to Jephthah's vow, the view expressed so distinctly by Josephus and the Chaldee was the one which generally prevailed in the earlier times among both Rabbins and fathers of the church, viz., that Jephthah put his daughter to death and burned her upon the altar as a bleeding sacrifice to Jehovah. It was not till the middle ages that Mos. and Dav. Kimchi and certain other Rabbins endeavoured to establish the view, that Jephthah merely dedicated his daughter to the service of the sanctuary of Jehovah in a lifelong virginity. And lastly, Ludov. Cappellus, in his Diatriba de voto Jephtae, Salm. 1683 (which has been reprinted in his Notae critic. in Jud. xvi., and the Critici Sacri, tom. i.), has expressed the opinion that Jephthah put his daughter to death in honour of the Lord according to the law of the ban, because human beings were not allowed to be offered up as burnt-sacrifices. Of these different opinions the third has no foundation in the text of the Bible. For supposing that Jephthah had simply vowed that on his return he would offer to the Lord whatever came to meet him out of his house, with such restrictions only as were involved in the very nature of the case - viz., offering it as a burnt-offering if it were adapted for this according to the law; and if it were not,…

This chapter gives as the history of Jephthah, another of Israel's judges, and numbered among the worthies of the Old Testament, that by faith did great things (Heb 11:32), though he had not such an extraordinary call as the rest there mentioned had. Here we have, I. The disadvantages of his origin (Jdg 11:1-3). II. The Gileadites' choice of him to be commander-in-chief against the Ammonites, and the terms he made with them (Jdg 11:4-11). III. His treaty with the king of Ammon about the rights of the two nations, that the matter might be determined, if possible, without bloodshed (v. 12-28). IV. His war with the Ammonites, which he enters upon with a solemn vow (Jdg 11:29-31), prosecutes with bravery (Jdg 11:32), and ends with a glorious victory (Jdg 11:33). V. The straits he was brought into at his return to his own house by the vow he had made (Jdg 11:34-40).