John Lightfoot on Matthew 1:5

[Booz of Rachab.] So far the Jewish writers agree with Matthew, that they confess Rachab was married to some prince of Israel, but mistaking concerning the person: whether they do this out of ignorance, or wilfully, let themselves look to that. Concerning this matter, the Babylonian Gemara hath these words: "Eight prophets and those priests sprung from Rachab, and they are these, Neriah, Baruch, Seraiah, Maaseiah, Jeremiah, Hilkiah, Hanameel, and Shallum. R. Judah saith, Huldah also was of the posterity of Rachab." And a little after, "There is a tradition, that she, being made a proselytess, was married to Joshua": which Kimchi also produceth in Joshua 6. Here the Gloss casts in a scruple: "It sounds somewhat harshly (saith it), that Joshua married one that was made a proselyte, when it was not lawful to contract marriage with the Canaanites, though they became proselytes. Therefore we must say that she was not of the seven nations of the Canaanites, but of some other nation, and sojourned there. But others say that that prohibition took not place before the entrance into the promised land," &c.